Insulating And Venting A Finished Attic

Plan to pull up the flooring and layer new insulation on top of the old.

Insulating and venting a finished attic.

5 year old house finished attic. The insulation is spray foam open cell directly on the underside of the roof deck min r19 and on the inside of the exterior walls. If it is and you plan to provide heating and cooling to the finished attic space you need to remove. Insulating a finished attic there are two basic ways to insulate a finished attic.

If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space. Permanent stairs carpet heat ceilings drywall completely finished. Ventilation the best method for ventilating any roof is to have some type of venting up high on the roof that allows for rising hot air or warm damp air to escape. To effectively ventilate your roof create a 1 in.

Install air chutes before installing insulation. The vent s size is about 50 60 of the length of the roof. The soffit vents allow convective air movement from the soffits of the residence to the ridge vent. Since parts of a finished attic are usually very close to the roof insulation often blocks proper ventilation that is needed under a roof structure.

I thought i might be able to do a little bit better with an injected foam insulation but i m not sure if the small r value improvement would be. Because the simplest and cheapest way to insulate an attic is to add material to the floor. The answer is rafter venting. Continuous ridge vents and soffit vents are often the most effective but it s.

In addition insulation baffles must be installed at the point where the attic floor meets the roofline to prevent the attic insulation from migrating into the cavities and restricting the airflow from the soffit vents. I d love to do better than the r 13 or r 15 that i get from the fiberglass batts in the sloped ceiling. About 6 feet in from the soffits on either side is a vertical finished wall that meets the ceiling. 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.

There are no vents in the lower attic and only 3 small square roof vents in the upper attic. If you re finishing your attic insulating it to the proper r value can cause a dramatic loss of. I have a finished attic in my vented roof home. There was ridge vent originally installed but sealed up with spray foam closed cell.

In this case the area behind the knee wall will be uncomfortably hot or cold. For this to be fully effective low vents should be installed to replace the air that is escaping. Insulate your finished attic properly choose your insulation.