[et_pb_section fb_built=”1″ specialty=”on” padding_top_1=”80px” padding_top_bottom_link_1=”false” padding_left_right_link_1=”false” admin_label=”Intro” _builder_version=”4.22.2″ custom_padding=”3px|||||” global_colors_info=”{}”][et_pb_column type=”2_3″ specialty_columns=”2″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_row_inner _builder_version=”4.16″ global_colors_info=”{}”][et_pb_column_inner saved_specialty_column_type=”2_3″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_post_title meta=”off” featured_image=”off” _builder_version=”4.16″ title_font=”Montserrat|600|||||||” title_text_color=”#000000″ title_font_size=”64px” title_line_height=”1.2em” title_font_size_tablet=”50px” title_font_size_phone=”24px” title_font_size_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”][\/et_pb_post_title][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner _builder_version=”4.16″ global_colors_info=”{}”][et_pb_column_inner saved_specialty_column_type=”2_3″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_text admin_label=”Intro Text” _builder_version=”4.27.2″ text_line_height=”1.8em” max_width=”600px” module_alignment=”center” locked=”off” global_colors_info=”{}”]<\/p>\n
Retrofitting older homes to improve their energy efficiency can reduce carbon emissions and could make a key contribution towards meeting the UK\u2019s 2050 carbon emissions target.\u00a0<\/span><\/p>\n BS5250 notes that there are around 7 million existing traditional solid wall buildings in the UK. Common problems in these older buildings include draughts, heat loss, and moisture problems due to lack of insulation. By retrofitting internal wall insulation (IWI) to solid masonry walls, homes can maintain more consistent indoor temperatures, reduce the need for heating and cooling, and enhance overall occupant comfort.\u00a0<\/span><\/p>\n In this post, we will review the key considerations for retrofitting internal wall insulation to solid walls, the need for careful detailing and the benefit of specifying a vapour permeable solution.<\/span><\/p>\n [\/et_pb_text][et_pb_text admin_label=”PDF Download” _builder_version=”4.24.2″ _module_preset=”default” background_color=”#00C4CC” text_orientation=”center” width=”100%” max_width=”600px” module_alignment=”center” global_colors_info=”{}”]<\/p>\n [Scroll to the end of the page to download this article as a handy PDF guide]<\/em><\/p>\n [\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/00-DLR5-3D-Detail.jpg” alt=”00 DLR5 3D Detail” title_text=”00 DLR5 3D Detail” admin_label=”Image 00″ _builder_version=”4.27.2″ custom_margin=”|-9vw|||false|false” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Quote Section” _builder_version=”4.21.0″ use_background_color_gradient=”on” background_color_gradient_direction=”90deg” background_color_gradient_stops=”#ffffff 70%|#00c4cc 70%” background_color_gradient_start=”#ffffff” background_color_gradient_start_position=”70%” background_color_gradient_end=”#00c4cc” background_color_gradient_end_position=”0%” custom_padding=”50px||3px||false|false” background_last_edited=”on|phone” background_color_gradient_stops_phone=”#ffffff 95%|#00c4cc 95%” background_color_gradient_start_position_phone=”95%” locked=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ max_width=”900px” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2021\/03\/magazine-18.png” _builder_version=”4.16″ custom_margin=”||50px||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.0″ text_font=”Cardo||||||||” text_text_color=”#2a2a2a” text_font_size=”42px” text_line_height=”1.4em” text_orientation=”right” text_font_size_tablet=”36px” text_font_size_phone=”24px” text_font_size_last_edited=”on|desktop” global_colors_info=”{}”]<\/p>\n Internal insulation is ideal for preserving the exterior aesthetics of a building, which is often a concern in older homes.<\/p>\n [\/et_pb_text][et_pb_divider divider_weight=”6px” _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Blog Post Body” _builder_version=”4.22.2″ collapsed=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.22.2″ _module_preset=”default” custom_padding=”100px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.5″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Key Considerations for Internal Insulation (H2)” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Key Considerations for Internal Insulation” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n Solid masonry walls can be insulated from the inside or the outside in order to achieve the level of thermal performance required of a heated building. There are advantages and disadvantages to both strategies. Internal insulation is ideal for preserving the exterior aesthetics of a building, which is often a concern in older homes. Below are some of the key things to consider before specifying internal wall insulation:<\/span><\/p>\n <\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/01-Christian-Brailey-Project.jpg” alt=”01 Christian Brailey Project” title_text=”01 Christian Brailey Project” align=”center” admin_label=”Image 01″ _builder_version=”4.27.0″ _module_preset=”default” width=”50%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 01″ _builder_version=”4.27.0″ _module_preset=”default” text_font_size=”15px” width=”50%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n The north London apartment retrofit by Christian Brailey included insulating the internal boundary walls and ceilings using Lime Green\u2019s <\/span><\/i>Warmshell Internal<\/i><\/b> solution<\/span><\/i><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Understand Moisture Management (H2)” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Understand Moisture Management” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n “Management of moisture in the fabric of buildings can be achieved either by excluding moisture from entering the fabric as far as possible, or by accepting that moisture is likely to enter and ensuring that it can move freely through the structure and evaporate from the surfaces.\u201d <\/i>(BS5250:2021)\u00a0<\/strong><\/p>\n BS5250 is a key resource as the code of practice for how moisture should be managed in buildings. Before installing internal insulation, it\u2019s essential to understand the building’s existing condition, particularly regarding moisture. Solid masonry external walls were traditionally designed to allow moisture to move through them. Moisture can enter the wall from two directions; from outside the building and from inside the building. It is important to consider both scenarios, in addition to the condition of the existing wall.<\/span><\/p>\n <\/p>\n Exposure to moisture externally<\/b><\/p>\n Moisture from outside the building can enter the wall as a result of weather exposure or rising damp. Its exposure to moisture is dependent on the graphical location of the site. An exposure zone map is available within Approved Document Part C (Diagram 12). The map categorises areas of the UK into exposure zones between the numbers of 1 and 4. Zone 1 is the most sheltered and zone 4 is the most severely exposed. Buildings within more exposed zones will be more susceptible to moisture related problems and will require more in depth assessment in line with BS5250 recommendations. <\/span><\/p>\n The penetration of moisture from outside can be controlled by careful detailing and maintenance of gutters, overhangs, pointing and damp proof courses etc. This is one reason why external render is common on traditional buildings in exposed areas like the west coast of Wales, Cumbria and Scotland. When done well it helps to keep out driving rain.<\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/02-APDC-Driving-Rain-Map.png” alt=”02 APDC Driving Rain Map” title_text=”02 APDC Driving Rain Map” align=”center” admin_label=”Image 02″ _builder_version=”4.27.0″ _module_preset=”default” width=”50%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 02″ _builder_version=”4.27.0″ _module_preset=”default” text_font_size=”15px” width=”80%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n Refer to Approved Document Part C for the latest exposure to driving rain map of the UK<\/span><\/i><\/p>\n [\/et_pb_text][et_pb_text admin_label=”Understand Moisture Management” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”30px||||false|false” global_colors_info=”{}”]<\/p>\n Exposure to moisture internally<\/b><\/p>\n Moisture from inside the building can enter the wall as a result of internal activities that involve warm, moist air such as cooking, washing or bathing. Its exposure to moisture is dependent on the inhabitants activity patterns and the effectiveness of any ventilation. The penetration of moisture from inside can be controlled by limiting the production of warm, moist air inside the building as far as possible and to restrict it from spreading from one room to another.<\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/03-Solid-Masonry-Breathable.jpg” alt=”02 APDC Driving Rain Map” title_text=”03 Solid Masonry Breathable” align=”center” admin_label=”Image 03″ _builder_version=”4.27.0″ _module_preset=”default” width=”70%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Understand Moisture Management” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n Existing wall condition<\/b><\/p>\n Prior to any insulation being installed, the condition of the external wall should be assessed in detail to assess the risk of moisture problems arising. Any defects need to be rectified and any connected elements such as gutters and flashings should be reinstated if defective. Take note of any impervious external or internal wall coverings that may be present. These may restrict the suitability of certain internal wall insulations.<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.22.2″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Consider a Vapour Permeable Solution (H2)” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Consider a Vapour Permeable Solution” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n Once it\u2019s been decided that internal wall insulation is suitable for the project, it\u2019s very important to research insulation materials to make an informed choice.\u00a0<\/span><\/p>\n Modern insulation materials are often vapour impermeable, which means that moisture can\u2019t escape naturally. Using impervious insulation on the internal face of a wall can stop the wall from being able to dry out towards the inside, as it would have done previously. Any gaps in the insulation (no matter how small) greatly increase the risk of any warm, moist air from inside the building condensing on the cold masonry surface and becoming trapped behind the insulation. <\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/04-Impermeable-Insulation-1-e1729001770532.jpg” alt=”04 Impermeable Insulation” title_text=”04 Impermeable Insulation” align=”center” admin_label=”Image 04″ _builder_version=”4.27.2″ _module_preset=”default” width=”75%” custom_padding=”||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Consider a Vapour Permeable Solution” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n To avoid the risk of issues associated with moisture, a good solution is to insulate solid masonry walls internally using vapour permeable materials. Vapour permeable materials allow the walls to absorb and release moisture, as they would have done originally. Both the insulation, and any wall coverings (both internal and external) must allow the transfer of moisture through the wall in order for the system to work.<\/span><\/p>\n It is worth noting that vapour permeable materials are often referred to as \u2018breathable\u2019 materials, but this term has the potential to be misunderstood. This is because vapour permeable materials often don\u2019t allow air to move through them (they can be air tight whilst still allowing moisture through). <\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/05-Permeable-Insulation-e1729001934717.jpg” alt=”05 Permeable Insulation” title_text=”05 Permeable Insulation” align=”center” admin_label=”Image 05″ _builder_version=”4.27.2″ _module_preset=”default” width=”75%” custom_padding=”||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Consider a Vapour Permeable Solution” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n The Internal Wall Insulation system featured in the Detail Library\u2019s retrofit construction details is the <\/span>Warmshell Internal<\/b> solution by <\/span>Lime Green<\/strong><\/span><\/a>. Warmshell Internal is a system of natural, vapour permeable insulation and lime plasters. The system ensures moisture can diffuse through the wall, keeping moisture levels within safe limits.<\/span><\/p>\n Warmshell Internal<\/b> consists of a levelling coat, board adhesive, woodfibre insulation boards and mesh reinforced vapour permeable plaster. The system is fitted without a cavity or void. Gaps used in dry lining systems, or dot and dab, are high-risk areas which can cause damp or rot and allow cold air to circulate, whereas wet plastering with naturally antiseptic lime helps wick moisture away and keeps the wall draught-free.<\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/06-Duro-Levelling-Coat.jpg” alt=”06 Duro Levelling Coat” title_text=”06 Duro Levelling Coat” align=”center” admin_label=”Image 06″ _builder_version=”4.27.0″ _module_preset=”default” width=”60%” custom_padding=”||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 06″ _builder_version=”4.27.2″ _module_preset=”default” text_font_size=”15px” width=”60%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n Application of the <\/span><\/i>Warmshell Internal<\/i><\/b> Duro Levelling Coat – a vapour permeable, wicking and draught-proofing layer that is applied directly to the inside of the existing masonry<\/span><\/i><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”How Much Is Too Much Insulation? (H2)” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”How Much Is Too Much Insulation?” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n When it comes to deciding on the amount of internal insulation to install, it\u2019s important to acknowledge that more doesn\u2019t always mean better.\u00a0<\/span><\/p>\n Adding higher levels of internal insulation to an existing wall is more risky than adding more modest amounts. Approved Document Part L guidance is accommodating of the fact that a house needs to be both warm and dry after retrofitting insulation on the inside.\u00a0<\/span><\/p>\n The U-Value required for the upgrade of an external wall is <\/span>not always<\/span><\/strong> 0.30 W\/m\u00b2K. It should take into account the risk of moisture problems, how much space will be lost and the payback period.\u00a0<\/span><\/p>\n A wall with less internal insulation (a higher u-value) will have less risk of moisture problems than a wall with lots of internal insulation (a lower u-value). The more insulation is added, the colder the existing wall becomes. This is because the wall becomes more isolated from the heated internal space. The colder the wall, the more likely it is that water vapour will condense on its surface. It is also more likely that significant thermal bridges could occur.\u00a0<\/span><\/p>\n The insulation manufacturer should be approached for advice regarding a safe thickness of insulation for each project, taking into account its location. In addition, BS5250 suggests that assessment in accordance with BS 15026 using software (such as WUFI) should be used where the project is located in zones severely and very severely exposed to driving rain (zones 3 & 4).\u00a0<\/span><\/p>\n With regards to the <\/span>Warmshell Internal<\/b> system, Lime Green suggest that there is often little point in aiming for a u-value lower than about 0.30 W\/m\u00b2K, even if there is no risk of moisture issues. Lower figures look better on paper, but there is no real-world energy saving due to thermal bridges and air leakage. It\u2019s better to spend more effort on air-tightness and detailing.<\/span><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/07-Warmshell-Internal-Lime-Plaster.jpg” alt=”07 Warmshell Internal Lime Plaster” title_text=”07 Warmshell Internal Lime Plaster” align=”center” admin_label=”Image 07″ _builder_version=”4.27.0″ _module_preset=”default” width=”60%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 07″ _builder_version=”4.27.2″ _module_preset=”default” text_font_size=”15px” width=”60%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n An example of the vapour permeable lime plaster internal finish that can be created with the <\/span><\/i>Warmshell Internal<\/i><\/b> solution<\/span><\/i><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”The Need for Careful Detailing (H2)” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”50px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”The Need for Careful Detailing” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n The addition of internal insulation to a building not only requires a robust strategy for the general envelope, but also for the junctions to be detailed carefully.<\/span><\/p>\n Work carried out badly can damage the fabric of the building and negatively impact the health of the occupants. It can also be expensive to rectify.\u00a0<\/span><\/p>\n Careful detailing at window, door, roof and floor junctions can reduce thermal bridging, which may otherwise cause cold spots and condensation.\u00a0<\/span><\/p>\n The Detail Library has developed a set of robust details for these key junctions in collaboration with People Powered Retrofit. <\/span>People Powered Retrofit<\/a><\/strong> provide expert advice to help plan, procure and deliver retrofit projects to a high standard. Each of the details in the Detail Library draw attention to both insulation and airtightness layers or membranes so that it\u2019s easy to check that continuity has been allowed for.\u00a0<\/span><\/p>\n <\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/08-No-Window-Reveal-Insulation.jpg” alt=”08 No Window Reveal Insulation” title_text=”08 No Window Reveal Insulation” align=”center” admin_label=”Image 08″ _builder_version=”4.27.0″ _module_preset=”default” width=”70%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 08″ _builder_version=”4.27.0″ _module_preset=”default” text_font_size=”15px” width=”70%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n A diagram highlighting the risks of poor detailing between the window and the internal wall insulation<\/span><\/i><\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/09-Window-Reveal-Insulation.jpg” alt=”09 Window Reveal Insulation” title_text=”09 Window Reveal Insulation” align=”center” admin_label=”Image 09″ _builder_version=”4.27.0″ _module_preset=”default” width=”70%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Image Caption 09″ _builder_version=”4.27.0″ _module_preset=”default” text_font_size=”15px” width=”70%” module_alignment=”center” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n A diagram highlighting how additional insulation to the window reveal can improve the junction<\/span><\/i><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Detailing Internal Wall Insulation (H2)” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”50px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Detailing Internal Wall Insulation” _builder_version=”4.27.2″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n Retrofitting internal wall insulation can significantly improve the energy efficiency and comfort of older homes. However, careful detailing and consideration of managing moisture is essential to avoid creating problems elsewhere.\u00a0<\/span><\/p>\n Vapour permeable solutions can mitigate moisture risks while enhancing thermal performance. By taking a considered approach that includes proper ventilation, moisture management, and airtightness, it\u2019s possible to improve thermal performance without compromising the building\u2019s integrity\u200b.<\/span><\/p>\n Check out the Detail Library for examples of construction details for the retrofit of internal wall insulation. Our recent details show examples of the Lime Green\u2019s <\/span>Warmshell Internal<\/b> vapour permeable woodfibre insulation solution applied directly to the internal face of an existing masonry external wall. <\/span><\/p>\n Further information regarding the Lime Green <\/span>Warmshell Internal<\/b> system, including technical guides, can be found on Lime Green\u2019s website.<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Download the Details (H2)” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”50px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/10-Oct24-DLR1-10-Retrofit-Internal-Wall-Insulation.png” alt=”10 Oct24 DLR1-10 Retrofit Internal Wall Insulation” title_text=”10 Oct24 DLR1-10 Retrofit Internal Wall Insulation” align=”center” admin_label=”Image Banner 01″ _builder_version=”4.27.2″ _module_preset=”default” width=”100%” custom_padding=”30px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_button button_url=”https:\/\/detail-library.co.uk\/october-2024-new-details\/” url_new_window=”on” button_text=”RETROFIT IWI DETAILS” button_alignment=”center” admin_label=”Button 01″ _builder_version=”4.27.2″ _module_preset=”default” custom_button=”on” button_text_size=”18px” button_text_color=”#FFFFFF” button_bg_color=”#00C4CC” button_border_width=”0px” button_letter_spacing=”0px” button_font=”|700||on|||||” button_use_icon=”off” global_colors_info=”{}” button_text_color__hover_enabled=”on|desktop” button_text_color__hover=”#FFFFFF”][\/et_pb_button][et_pb_divider divider_weight=”6px” admin_label=”Divider” _builder_version=”4.24.2″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”30px||50px||false|false” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.20.0″ _module_preset=”default” collapsed=”off” global_colors_info=”{}”][et_pb_row column_structure=”1_2,1_2″ admin_label=”Lead magnet form” _builder_version=”4.21.0″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Download the Guide” _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_code _builder_version=”4.25.1″ _module_preset=”default” border_radii=”on|10px|10px|10px|10px” border_color_all=”#00C4CC” global_colors_info=”{}”]<\/p>\n [\/et_pb_code][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2024\/10\/35-Retrofit-Internal-Wall-Insulation.jpg” alt=”35 Retrofit Internal Wall Insulation” title_text=”35 Retrofit Internal Wall Insulation” align=”center” _builder_version=”4.27.2″ _module_preset=”default” width=”50%” box_shadow_style=”preset1″ box_shadow_blur=”10px” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” admin_label=”Divider” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”30px||50px||false|false” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_text admin_label=”Resources” _builder_version=”4.22.0″ header_2_font=”Montserrat|600|||||||” header_2_font_size=”70px” header_2_line_height=”1.2em” max_width=”750px” header_2_font_size_tablet=”48px” header_2_font_size_phone=”36px” header_2_font_size_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Resources” _builder_version=”4.22.0″ text_font=”Montserrat|700|||||||” text_text_color=”rgba(0,0,0,0.06)” text_font_size=”90px” text_line_height=”1.2em” custom_margin=”-120px|||-120px|false|false” custom_margin_tablet=”-90px|||-60px|false|false” custom_margin_phone=”-70px|||-40px|false|false” custom_margin_last_edited=”on|desktop” text_font_size_tablet=”80px” text_font_size_phone=”60px” text_font_size_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”]Resources [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2023\/07\/Project-Case-Study.png” alt=”Project Case Study” title_text=”Project Case Study” url=”https:\/\/detail-library.co.uk\/using-the-detail-library-live-project-case-study\/” url_new_window=”on” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2023\/02\/Garage-Conversions.png” alt=”Project Case Study” title_text=”Garage Conversions” url=”https:\/\/detail-library.co.uk\/technical-study-garage-conversions\/” url_new_window=”on” _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”References and Useful Links” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”50px||50px||false|false” global_colors_info=”{}”]<\/p>\n <\/p>\n People Powered Retrofit<\/a><\/strong><\/p>\n Lime Green<\/a><\/strong><\/p>\n Lime Green building regulations advice<\/a><\/strong><\/p>\n Lime Green U-value advice<\/a><\/strong><\/p>\n BS5250:2021 <\/span>Management of moisture in buildings<\/span><\/p>\n Approved Documents Part C, Part L & Part B<\/span><\/p>\n A Bristolian\u2019s Guide to Solid Wall Insulation commissioned by Bristol City Council<\/span><\/p>\n Sustainable Renovation Guide by Chris Morgan<\/span><\/p>\n Department for Business, Energy & Industrial Strategy, Retrofit Internal Wall Insulation Guide to Best Practice, 2021<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,2_3″ admin_label=”Emma Thackstone Author Bio” _builder_version=”4.16″ _module_preset=”default” width=”70%” module_alignment=”center” custom_padding=”||||false|false” box_shadow_style=”preset1″ global_module=”84617″ saved_tabs=”all” global_colors_info=”{}”][et_pb_column type=”1_3″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2023\/02\/Emma-T-Cropped.jpg” title_text=”Emma T Cropped” align=”center” _builder_version=”4.27.0″ _module_preset=”default” width=”100%” max_width=”50%” custom_padding=”10px||||false|false” border_radii=”on|100%|100%|100%|100%” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”2_3″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Author” icon_placement=”left” image_icon_width=”99%” content_max_width=”1100px” admin_label=”Author bio” _builder_version=”4.27.0″ _module_preset=”default” header_level=”h2″ width=”100%” max_width=”100%” module_alignment=”left” custom_padding=”|75px|||false|false” image_max_width=”99%” global_colors_info=”{}”]<\/p>\n Written by Emma Thackstone. Emma is an architect. At the Detail Library, Emma helps the Detail Library with drawing new details and carrying out technical research.<\/p>\nKey Considerations for Internal Insulation<\/h2>\n
\n
Understand Moisture Management<\/h2>\n
Consider a Vapour Permeable Solution<\/h2>\n
How Much Is Too Much Insulation?<\/h2>\n
The Need for Careful Detailing<\/h2>\n
Detailing Internal Wall Insulation<\/h2>\n
Download the Details<\/h2>\n
Download the Guide<\/h2>\n
Resources<\/h2>\n
\n[\/et_pb_text][et_pb_text admin_label=”Related Reading” _builder_version=”4.27.0″ _module_preset=”default” custom_padding=”50px||||false|false” global_colors_info=”{}”]<\/p>\nRelated Reading<\/h3>\n
References and Useful Links<\/h3>\n