Insulate Hip Roof By Crawlspace Detail

One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside.

Insulate hip roof by crawlspace detail.

Originally we insulated with the pink fluffy stuff. C no slab edge insulation is recommended. If your crawlspace has stone and mortar walls you must use closed cell spray polyurethane foam. Install at least as much continuous insulation on the inside or outside as required by the 2012 irc.

Jm comforttherm kraft faced and unfaced insulation are all possible products to use for this application. What is the best way to insulate and more importantly ventilate an addition with a hip roof and a very low pitch. It will keep out all the outdoor air. Cover the walls with insulation from the sill plate to the plastic covered dirt floor.

In our case it was 5 in because of the 4 1 hip roof. If vents are not present in your crawl space insulate the walls instead of the joist bays. However many building professionals now recognize that building an unventilated crawlspace or closing vents after the crawlspace dries out following construction is the best option in homes using proper moisture control and exterior drainage techniques. As a result your crawl space will stay warm during the winter and cool in the summer.

With bird cut rafters all i had was 3 5 at the outer edge of the exterior wall plate after the site built foam baffles 3 4 xps were installed. The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. With kraft faced insulation the facing is generally against the subfloor. In an unvented crawl space you should insulate the perimeter walls.

You could opt for thick insulation with a radiant barrier and an r 11 value. Most building codes require vents to aid in removing moisture from the crawlspace. The rafters are 2x8 s. To insulate the roof you will need to use a combination of insulation to fully protect the roof.

A vapor retarder e g 4 or 6 mil polyethylene film should be installed on the ground to reduce moisture migration into the crawl space. How you insulate a crawlspace depends on whether it s ventilated or unventilated. B insulate crawl space walls only if the crawl space is dry all year the floor above is not insulated and all ventilation to the crawl space is blocked. R 5 for climate zone 3 r 10 for climate zone 4 except marine zone 4 and r 15 for marine zone 4 and climate zones 5 6 7 and 8.

Insulate your crawl space walls and the ceiling for maximum climate control.