Insulate Hip Roof By Crawlspace Detail

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.

Insulate hip roof by crawlspace detail.

The rafters are 2x8 s. In an unvented crawl space you should insulate the perimeter walls. To insulate the roof you will need to use a combination of insulation to fully protect the roof. If your crawlspace has stone and mortar walls you must use closed cell spray polyurethane foam.

How you insulate a crawlspace depends on whether it s ventilated or unventilated. With kraft faced insulation the facing is generally against the subfloor. With the 9 of insulation on the outside wall up to that baffle we ve not seen any sweating near the shower in winter and the house is so much. Most building codes require vents to aid in removing moisture from the crawlspace.

Install at least as much continuous insulation on the inside or outside as required by the 2012 irc. You could opt for thick insulation with a radiant barrier and an r 11 value. If vents are not present in your crawl space insulate the walls instead of the joist bays. Originally we insulated with the pink fluffy stuff.

Insulate your crawl space walls and the ceiling for maximum climate control. One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside. 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. 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.

Jm comforttherm kraft faced and unfaced insulation are all possible products to use for this application. Step 1 add a vapor barrier. 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. Cover the walls with insulation from the sill plate to the plastic covered dirt floor.

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. The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. As a result your crawl space will stay warm during the winter and cool in the summer. The roof overall is 26 x8 and the max height where it meets up with the house is maybe 2 2 1 2 high.

In our case it was 5 in because of the 4 1 hip roof.