Finished Attic No Soffit Vents

How to insulate an attic ceiling with no soffit vent 1.

Finished attic no soffit vents.

It makes sense that the wettest spots are near the beam because that s the most likely site for humid air leakage from the indoors. This gives you access to all parts of the attic. For an attic without soffit vents you may have the option to use gable vents instead. To meet all three goals insulating your finished attic ventilating the roof and maximizing headroom use a combination of dense batt insulation rigid foam sheeting and air chutes.

Of attic space equally divided between eave and ridge vents. I m presuming that the roof has good eave detailing so that rain does not enter at the beam. But building scientist joe lstiburek takes issue with that opting instead for more ventilation at the eaves say a 60 40 split with the eaves getting the greater proportion. Place the plywood sheets or boards across the rafters in the attic.

Smart vent a special roof eaves vent product that provides a 3 4 opening about 6 above the top of the roof drip edge. Figure out how much insulation you need for the area of the country in which you live by accessing the the u s. For this reason the square footage of vent space at the base of. For the same reason insulation shouldn t touch the roof s underside.

Codes require a net free ventilation area nfva of 1 sq. Of vents for each 300 sq. It must also circulate. The answer is rafter venting.

However without soffit vents that makeup air comes from indoors a situation that is not desirable in any season. This is called passive ventilation. The function of soffit vents for proper ventilation it isn t enough for air to simply get into your attic. The most common way to add ventilation to an attic is by installing air intakes in the soffits and putting an outlet at the gable of the house.

Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof. If you re finishing your attic insulating it to the proper r value can cause a dramatic loss of headroom if you limit yourself to fiberglass batts. Normal vented air likes to enter the attic lower down near the bottom third of the attic and as it passes through it will exit higher up near the top third of the attic space. Venting solutions for roofs with no overhang or soffit install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.

This creates a natural air flow by drawing in the air from outside pushing it up and out through the vent at the top of the house.