Insulation For Flat Roof Without Attic

If you put cellulose up there it will help insulate but you need a vapor barrier above the ceiling because you ll have warm ceiling air hiiting colder roof surface and condensing which will turn the cellulose into a moldy mess.

Insulation for flat roof without attic. Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. However in many situations the insulation may need to be primarily or entirely below the flat roof membrane and between the roof joists if so what are the best options. Zone is 6 my hdd is 7200 and design temp is 20 although that is fairly extreme and probably in the 98th percentile. This means lowering the height of the ceiling but may be a better option than insulating externally.

The house has a 1 12 pitch roof. Run a 2x4 flat around the parmiter of the roof. Starting at one edge accross the roof to the other edge. Unvented flat roofs a technical discussion flat roofs have often been built with the insulation all on top of the vapor closed drainage plane as this avoids dew point condensation issues inboard of the roofing.

A homeowner s guide to attic and rafter insulation. The ceiling is flat the roof will be a 2x4 truss system with a 1 energy heal on the double stud wall. Compromising the effectiveness of the insulation. I was planning on using a vented attic unless i spray foam it of course.

As it sits i. Box out light fixtures. Chauk line to idenify where your rafters are. We ve had a new 60 mil gaf tpo roof system put on our house.

Running with the slope lay 1x4 lumber flat onto the insulation 2ft o c. The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. So glad i found your site.

Strip off the roof. Fill the area with 1 5 inches thick polyiso. A 1 5 inch polyiso insulation was installed under the tpo with a 2 4 boarder as a nailer support. Assessments in addition to checking for structural problems check the condition of the roof framing sheathing finish and the soffit and fascia for signs of moisture problems such as leaks stains mould flaking or rot.

Flat roof in many cases it is easier and more cost effective to insulate a flat roof internally using insulated plasterboard. Because most flat roofs don t have an attic crawl space or venting the insulation must go underneath the roof s covering on the exterior of the home or be placed on the inside of the home. Unless you re using mineral wool insulation or your fixtures are rated safe for contact with any type of insulation don t allow the material to touch or cover recessed cans or lights from the floor below it s a fire hazard. Use construction adhesive between 1x4 and insulation board.