Retrofit Pitched Roof Insulation

Together with not having to provide a ventilation pathway the technique permits insulation to be installed within the full depth of the rafter.

Retrofit pitched roof insulation.

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 mbci nuroof retrofit roof system utilizes light gauge 16 ga. The performance of products and methods of fixing vary. See http solaralberta ca pdfs harold 20orr pdf we have done several roofs this way 1.

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. The panel adds a remarkable amount of structure as well as insulation to the project. 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. We have done many roof retrofits with a structural insulated panel nail base panel.

Since older pitched roofs usually have a relatively vapor tight exterior lining e g. Nb the roof insulation methods illustrated below are for general guidance only. 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. To 12 ga steel framing installed over the existing roof s framing members to create a sloped plane.

We go right over the existing shingles. Of your email interested please feel free to contact us on facebook at cp millworks business page. Kingspan with a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. The existing roof s physical footprint framing system and other rooftop conditions will most likely control the new roof s geometry.

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. First unfaced blanket insulation can be installed on top of the existing roof membrane prior to the installation of the new metal roof membrane. 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. Cover the roof with 6mil poly sealed at the wall line to the vb in the wall.

This insulation can dramatically alter the energy consumption of the building by providing a much warmer hat for that building. Bituminous roofing felt on wood sheathing they require an analysis of possible condensation problems.