Roof Insulation On Metal Deck

Armstrong world industries inc.

Roof insulation on metal deck.

Air sealing hot roofs is critical. The dew point is typically within the insulation layer lowering condensation risks. Vented attics have insulation installed underneath the roof deck in direct contact with the decking. For most of us in the low slope roofing industry it s considered to be absolutely standard to have insulation placed above the roof deck.

Heat and cold penetrate metal. In this article we are going to explore both financial and technical aspects when it comes to looking for the best method to insulate the metal roofing. Remove existing roofing and non adhered underlayment to expose roof sheathing. Make sure there is adequate air flow from the eave vents to the attic area.

We then vented that space through the roof deck as was the normal practice for roofing. This gives a 1 air space between the roof deck and the insulated area. Ceiling insulation is then installed on the attic floor. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic.

Metal roofs are poor insulators. For standard steel deck construction this approach has many advantages such as. Because the insulation is so close to the roof and you want to avoid unwanted moisture buildup these roofs will need to be completely sealed off. Of attic floor area and where at least 30 percent of the free ventilation area.

On one project in kansas we installed 1 x 1 along both sides of the rafters and then added 3 8 plywood to them. Three in one composite roof deck panels provide acoustics insulation and a nailable surface that accepts a wide variety of roofing materials. Tectum e tectum e n acoustical roof deck description. Our new smooth series cellular deck offers a blemish free beam to pan rivet.

Metal roofs are durable and last much longer than conventional roof deck and shingle constructions but they come with a drawback. Insulation with a thermal resistance of at least 0 85hr ft2 degree f btu or at least 3 4 inch air space is added to the roof deck over an attic or 7. Free ventilation area of attic ventilation for every 150 sq. In climate zones 10 12 and 13 with 1 sq.

Insulation must secure properly to the roof deck to provide an acceptable substrate for the roof covering. Talking about metal roof insulation this thing is one of the most challenging things people work in this field is facing it demands and requires excellent skill and expertise which you may only get from a reputable roofing contractor. It involves adding an air chamber under the roof deck. This type of fastening also is acceptable on other deck types including cast in place concrete and gypsum.