Gaps Roof Attic Bottom

The space above the top plate of exterior walls at the bottom of each rafter bay is especially important.

Gaps roof attic bottom.

Gaps in the attic or between the lower floors and the attic will let heated or cooled air escape to the great unconditioned outdoors making any insulation you add essentially useless. From the outside the roof looks in tact but today when i went into the attic i noticed small gaps in the roof where holes of light were evident. Unfortunately in most homes this is not the case. The roof decking is left slightly shorter than the rafter ends creating a gap between the roof and the gutter.

How much of a gap should i leave at the tops and the bott. The hot air will travel the path of least resistance to make its way out of your attic. This material should have extended all the way to the bottom ends of the rafter joists where the roof deck meets the fascia board basically the area where the gutters are hung. Baffles placed in this area channel intake air into either the attic space or vent chutes and also prevent insulation from falling into the soffit and blocking airflow.

By leaving a gap some of the air behind the foil will come in to the attic but that is ok. The most common blown in material used but it can rot and grow moldy if exposed to moisture. I m installing atticfoil radiant barrier using the staple up method. I am in the process of buying a new house.

The success of a vented attic or roof deck relies on its airtightness. Radiant barrier foil question.