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A Guide to Solid Wall Insulation

A Guide to Solid Wall Insulation. Agenda. I ntroduction S olutions I nternal S olutions E xternal S olutions S ummary Q uestions. Introduction – The facts about Hard to Treat Homes. HTT homes account for 43% of stock but actually emits over half the CO2 from all homes.

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A Guide to Solid Wall Insulation

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  1. A Guide to Solid Wall Insulation

  2. Agenda • Introduction • Solutions • Internal Solutions • External Solutions • Summary • Questions

  3. Introduction – The facts about Hard to Treat Homes • HTT homes account for 43% of stock but actually emits over half the CO2 from all homes. • Over half of the HTT stock is in the private sector. • 65% of PRS is HTT

  4. Introduction – The facts about Hard to Treat Homes • HTT properties tend to be more difficult and expensive to improve in terms of providing adequate insulation and heating. • Over 50% of fuel poor households live in HTT homes • There are around 9.2 million dwellings that can be considered HTT (43% of the housing stock) • 6.6 million properties have solid walls (31% of the total housing stock) • Of the 326,000 high rise flats in England 48% have solid walls.

  5. Introduction - What is a Hard to Treat Home? • These types of property often fall into one or more of the following categories: • Solid wall construction • No loft space • Off the mains gas network • Non traditional construction • Non standard cavity

  6. Introduction - What is a solid wall? • 9” masonry walls and other non-traditional construction types such as single leaf masonry, >9” walls (e.g. thick stone walls) • concrete walls, metal or timber panels and some mixed wall types (e.g. Where the ground and first floors are constructed of different materials) • BRE estimate that around 7% of unfilled cavity wall stock cannot receive CWI. • High rise flats (at least 6 storeys high) – esp. 1953-1972

  7. Introduction - What is a solid wall? • Hard to treat not really…. expensive to treat as opposed to loft and cavity • Solid wall solutions • Internal and external

  8. Internal Wall Solutions Rigid boards Internal Dry Lining (Direct Fix) Internal Dry Lining (On Straps) Internal Dry Lining (Filled Studs) External Render System Internal Flexible Lining

  9. Internal Wall Solutions What are the solutions? Typically consists of either dry lining in the form of flexible thermal linings available in 1 metre by 12.5 metre rolls, laminated insulating plasterboard (known as thermal board), or built-up systems using fibrous insulation such as mineral wool held in place using a studwork frame. Flexible thermal lining Rigid board

  10. Internal Wall Solutions Case Study – Flexible thermal lining SEMPATAP The problem A solid wall Victorian terraced property with an uninsulated converted loft space. The solution Sempatap is thermal insulation on roll which is applied like wallpaper and at only 10mm thick does not cause significant disruption during installation. This product can be applied to ceilings as well as walls and provides a solution for properties without a loft space as well as those with solid walls. It can also be applied to the underside of floorboards in a cellar/basement.

  11. Internal Wall Solutions Case Study – Flexible thermal lining

  12. Internal Wall Solutions Case Study – Flexible thermal lining The product is applied using a special adhesive using a roller or brush and can be easily cut to size using wallpaper shears or scissors. Once the product has been applied it can be painted, papered or even tiled. The manufacturer of this product expect it to have a life expectancy of 30 years. Due to the flexibility of the product it can be used on uneven walls and irregular surfaces and can be used on sloping walls and ceilings in converted loft spaces. The product is only applied to the exterior facing interior walls of the property.

  13. Internal Wall Solutions Training and time frames(Flexible thermal lining) SEMPATAP • TRAINING • On site training is provided for all contractors in the application of Sempatap Thermal • On site training is always preferred as it covers a real life installation and the difficulties that can be encountered • The trainer acts as part of the installation team for the period of training • Training is carried out on site and frequently takes place in occupied properties. • SKILLS • Sempatap Thermal is not difficult to apply, the skills required are similar to a decorator/wallpaper hanger or dry lining contractor

  14. Internal Wall Solutions Case Study – Rigid boards • SPACETHERM • The problem • Continuity of the existing cavity fill missing in places and dampness. • Damaged external render led to damp inner wall surfaces • Internal damp led in turn to cold spots and mould growth • Cold bridging at door/window lintels • The solution • Aerogel insulation was laminated to Fermacell. The existing lath & plaster was removed and the thermal laminate fixed directly through the board to the existing brick.

  15. Internal Wall Solutions Case Study – Rigid boards

  16. Internal Wall Solutions Case Study – Rigid boards • The solution • No specialist contractors required • Can be installed room-by-room with tenants in situ • Does not require upgrading entire blocks at once • Increases internal surface temperature • Improves response to heating input when heated intermittently • Lowest thermal conductivity available (0.013 W / mK) • Hydrophobic, allowing installation on damp substrate without drying periods • Integrated foil layer, reducing condensation risk on solid walls • Fermacell wallboard allows fixing of units, radiators, etc to inner surface, reducing cold bridging

  17. Internal Wall Solutions Case Study – Rigid boards

  18. Training and time frames (Rigid boards) No specialist skills required- tradesman level Training can be given on first installation with some systems Final surface may need plaster/tape and filling depending on client preference Depending on the system, will be screwed or dot and dab Installation time of an average 3 bedroom semi is 2.5 days for 2 man team after preparation work Price depends on system and thickness but is around £10- £55/m2 Ancillary costs of skirting boards, sockets etc. Internal Wall Solutions SPACETHERM

  19. Site supervision and surveys A survey of the property is required to assess the suitability of the substrate and assess any ancillary work required Supervision will vary depending on the system Low level of supervision required with most systems Internal Wall Solutions

  20. External Wall Solutions What are the solutions? Comprise of an insulation layer fixed to the existing wall, with a protective render or decorative finish. Dry cladding offers a wide range of finishes such as – timber panels, stone or clay tiles, brick slips or aluminium panels.

  21. External Wall Solutions Why Externally Insulate? • Tomeet the Decent Homes Standard - A decent home is windproof, weathertight and warm, with modern facilities - The Government expects all homes to meet this standard by 2010 • Increases thermal quality of the building • - Particularly relevant when refurbishing non-traditional housing • Overcomes moisture/condensation issues • Protects the existing building envelope • Reduces heating bills by 25% • Improves the building’s appearance

  22. External Wall Solutions What is External Wall Insulation? • A method of upgrading the thermal performance and external appearance of existing properties • Insulated and rendered properties are transformed into warm, energy efficient and attractive homes/buildings Before After

  23. External Wall Solutions External Wall Insulation – Key Components • Beads and closures • Insulation • Fixings • Reinforcement layer • Base render coat • Finish coat

  24. External Wall Solutions Choice of Insulation – Comparative Performance

  25. External Wall Solutions Rendering options • Hand applied finish coat • Hand applied base coat • Machine applied one coat • Brick slips

  26. Finishes available External Wall Solutions Dry dashusing 6-8mmcoloured aggregate Mineral render scraped texture Spray roughcast Light synthetic aggregateusing an acrylic binder Brick slips or brick-effect render

  27. External Wall Solutions Upgrading Housing Stock • Common Property Types • Myton • Swedish Timber • Tarran • BISF • Reema • Wimpey No-fines • Unity • Easiform • Spooner • Airey • Solid Brickwork • Traditional Masonry Cavity

  28. Benefits of External Wall Insulation for Solid Walls External Wall Solutions • No internal living space is lost • Minimum disruption involved – decanting of residents not required • Condensation risk moved to outside of system – structure stays warm and dry • Low u-values achieved saving carbon emissions and energy costs • Minimal maintenance once installed • Equally suitable for low and high rise schemes with funding available

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