Insulation For Flat Roof Without Attic

Box out light fixtures.

Insulation for flat roof without attic.

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. Running with the slope lay 1x4 lumber flat onto the insulation 2ft o c. Flat roof in many cases it is easier and more cost effective to insulate a flat roof internally using insulated plasterboard. This means lowering the height of the ceiling but may be a better option than insulating externally.

I was planning on using a vented attic unless i spray foam it of course. Compromising the effectiveness of the insulation. 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. Fill the area with 1 5 inches thick polyiso.

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. Attics or roofs without a working space are covered later in this chapter in section 5 4 cramped attics cathedral ceilings and flat roofs. Chauk line to idenify where your rafters are. Cathedral without any attic space.

Run a 2x4 flat around the parmiter of the roof. Use construction adhesive between 1x4 and insulation board. So glad i found your site. The house has a 1 12 pitch roof.

Zone is 6 my hdd is 7200 and design temp is 20 although that is fairly extreme and probably in the 98th percentile. As it sits i. An attic you want vented but in your case you want the ceiling roof space sealed. 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.

Strip off the roof. 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. The ceiling is flat the roof will be a 2x4 truss system with a 1 energy heal on the double stud wall. 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.

A homeowner s guide to attic and rafter insulation. 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. 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. Starting at one edge accross the roof to the other edge.