Features & Advantages of SWIP IWI System

Features of the SWIP IWI System

  • A cost-effective, thermally efficient solution
  • Quick and easy to install so rooms are out of commission for the minimum period
  • Can improve the acoustic performance of the existing external wall
  • Finished using a plaster skim coat or dry lining techniques
  • No need to remove existing wall finish, unless un-sound
  • System can accommodate wall imperfections
  • Easily adapted around openings such as windows and doors
  • Can easily accommodate fixings for fittings such as radiators, pictures and shelving

The use of SWIP Studs eliminates the thermal bridging issue associated with systems incorporating timber and metal studs. The thermal resistance of SWIP Studs, provides a high level of thermal resistance, which is comparable to that of the Earthwool SWIP Batts fitted between the SWIP Studs. For instance, the SWIP IWI System is almost 13% more thermally efficient than a timber stud system of the same thickness.

Compared with other internal insulation methods, the SWIP IWI System has the following additional advantages:

  • The system components are unaffected by moisture
  • A minimum number of lightweight, easy to handle, components are required
  • System thickness is comparable to alternative solutions, but greater thicknesses can be provided simply by installing two studs, one on top of the other
  • Airtight system enables maximum thermal efficiency to be achieved
  • Incorporates highly sustainable glass mineral wool insulation
  • Earthwool SWIP Batts have the maximum Euroclass A1 reaction to fire rating to BS EN 13501: Part 1

A typical 225mm (nine inch) thick un-insulated masonry external wall with dense plaster internally will achieve a U-value of approximately 2.00W/m2K. The same wall insulated with the SWIP IWI System, using 95mm thick SWIP Studs, will achieve a U-value of at least 0.30W/m2K, an improvement in thermal performance of over 80%.

If a typical three bedroom semi-detached house were to be upgraded in this manner, it would reduce the carbon emissions associated with the house by approximately 2 tonnes per year.

Three SWIP Stud thicknesses are available, 65, 80 and 95mm, which can be combined to give a variety of thickness solutions.

Enhanced thermal performance can be achieved by installing double layers of SWIP Studs. For instance, a combination of two 65mm SWIP Studs will achieve a U-value of 0.25W/m2K. After securing SWIP Studs in accordance with the installation instructions on pages 15 -19, screw fix a second SWIP Stud to the first one. Both SWIP Studs should be installed in the vertical position. When fixing the second SWIP Stud it is essential that the screws should be sufficient to ensure a minimum 38mm penetration into the first SWIP Stud. Care should be taken to ensure that the two sets of screws are not installed in coincident positions. Earthwool SWIP Batts, plasterboard and SWIP Vapour Control Layer are installed in the same manner as in a single stud application.

The SWIP IWI System incorporates Earthwool SWIP Batt glass mineral wool insulation, which has the following sustainability credentials:

  • It has the maximum A+ generic BRE Green Guide rating
  • The basic raw materials are silica sand (the earth’s most common mineral) and recycled glass bottles
  • It can be recycled at the end of the building’s life
  • Manufactured using ECOSE® Technology a revolutionary new formaldehyde-free binder technology, based on rapidly renewable materials instead of petro-based chemicals. It reduces embodied energy and delivers superior environmental sustainability
  • Supakube compression packaging saves energy and delivers more product per pack

Existing dwellings can suffer from excessive air leakage which, if not treated, can lead to high energy costs, occupant discomfort from draughts & external noise, as well as a reduction in indoor air quality. To ensure that upgrading of external walls is as effective as possible, it is important to keep air leakage to an absolute minimum & preferably prevent it. Air leakage can be between the interior & exterior environments, as well as between different elements of the building envelope. Air leakage through the masonry wall occurs through cracks in the bricks, gaps where there is poor adhesion between the mortar & the masonry units, or diffusion through the masonry units themselves. Where the plaster has been removed & air leakage through the wall is thought to be excessive, it should be tackled before the SWIP IWI System is installed by applying a parge coat to the inner surface of the wall. As the insulation component of the SWIP IWI System is in intimate contact with the vapour control layer, air movement behind the system should be negligible. However, to prevent unwanted air leakage all junctions with other elements should be well sealed with particular attention being paid to the joints between the SWIP IWI System and window frames. The SWIP IWI System incorporates SWIP Vapour Control Layer which also acts as an air leakage barrier and enables the system to be integrated with other elements of the building such as ceilings and intermediate floors which is essential if air leakage levels are to be minimised or negated. In addition, SWIP Multi-Purpose Sealant should be used to seal electric sockets against the plaster-board, as well as all gaps around plumbing service penetrations. Any large gaps or penetration through the dry lining system can be sealed with expanding foam.

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