Retrofit Pitched Roof Insulation

There is a requirement when refurbishing a roof to have a minimum u value of 0 18 w m k in england and wales but for a complete re roof in wales the minimum u value required is 0 15 w m k.

Retrofit pitched roof insulation.

Cover the roof with 6mil poly sealed at the wall line to the vb in the wall. German standard din 4108 3 dispenses with calculational approval if the room side vapor barrier has a very high vapor resistance s d value 100 m. The mbci nuroof retrofit roof system utilizes light gauge 16 ga. Of your email interested please feel free to contact us on facebook at cp millworks business page.

How to retrofit a roof with insulation in my humble opinion i believe the only way to effectively and cost wise to solve the problem is to insulate from the top. The panel adds a remarkable amount of structure as well as insulation to the project. On new build or replacement pitched roofs the ideal build up would be insulation fitted over and then between the rafters giving a big boost for airtightness image credit. U values normally achievable for the rafter level insulation of a pitched roof are between 0 20 0 16 w m2k depending on existing rafter depth and available space.

See http solaralberta ca pdfs harold 20orr pdf we have done several roofs this way 1. Since older pitched roofs usually have a relatively vapor tight exterior lining e g. We have done many roof retrofits with a structural insulated panel nail base panel. The existing roof s physical footprint framing system and other rooftop conditions will most likely control the new roof s geometry.

We go right over the existing shingles. To 12 ga steel framing installed over the existing roof s framing members to create a sloped plane. The est target u value for the rafter level insulation of a pitched roof is 0 20 w m2k though much higher values are achievable. Breather membrane in colours u value target.

Bituminous roofing felt on wood sheathing they require an analysis of possible condensation problems. This insulation can dramatically alter the energy consumption of the building by providing a much warmer hat for that building. Together with not having to provide a ventilation pathway the technique permits insulation to be installed within the full depth of the rafter. In conjunction with the three step metal retrofit roofing process two other factors can improve the existing flat roof.

The performance of products and methods of fixing vary. First unfaced blanket insulation can be installed on top of the existing roof membrane prior to the installation of the new metal roof membrane.