Insulate Hip Roof By Crawlspace Detail

To insulate the roof you will need to use a combination of insulation to fully protect the roof.

Insulate hip roof by crawlspace detail.

The rafters are 2x8 s. 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. Most building codes require vents to aid in removing moisture from the crawlspace. Originally we insulated with the pink fluffy stuff.

Cover the walls with insulation from the sill plate to the plastic covered dirt floor. Step 1 add a vapor barrier. In our case it was 5 in because of the 4 1 hip roof. Install at least as much continuous insulation on the inside or outside as required by the 2012 irc.

What is the best way to insulate and more importantly ventilate an addition with a hip roof and a very low pitch. The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. 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. 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.

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. Insulate your crawl space walls and the ceiling for maximum climate control. It will keep out all the outdoor air. If vents are not present in your crawl space insulate the walls instead of the joist bays.

One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside. If your crawlspace has stone and mortar walls you must use closed cell spray polyurethane foam. With kraft faced insulation the facing is generally against the subfloor. As a result your crawl space will stay warm during the winter and cool in the summer.

How you insulate a crawlspace depends on whether it s ventilated or unventilated. The roof overall is 26 x8 and the max height where it meets up with the house is maybe 2 2 1 2 high. C no slab edge insulation is recommended. You could opt for thick insulation with a radiant barrier and an r 11 value.

Jm comforttherm kraft faced and unfaced insulation are all possible products to use for this application.