How To Insulate A Flat Built Up Roof With Styro

Framing this out and buying 30 r fiberglass insulation will cost you about 50 more than just buying 5 inches of polyiso equivalent of 30 r.

How to insulate a flat built up roof with styro.

Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. With this kind of roof the insulation follows the slope of the roof. With a flat roof however this becomes a major concern. The chances of water seepage with a slanted roof are less simply because water is designed to run off and does not pool up anywhere.

Insulated roof assemblies can be vented or unvented. Then install r 30 fiberglass batts between the rafters. The correct method for a flat roof is under the current regulations to have a warm roof. Kingspan with a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

Creating a positive slope roof is traditionally done by installing rigid board insulation such as xps or polyiso on flat or low sloped roofs. Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system. Both these variants require different approaches to insulation which will be covered in this guide. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies.

How to insulate a flat roof. You would only do this however if replacing the roof covering on top and you have the height above the roof to do this. In a nutshell you would sandwich 130mm of solid insulation between two decks allowing to place a vapour barrier on top of the first deck. Newfoundland styro flat roof insulation provides the high long term r value of eps.

The traditional fix is labor intensive. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. On new build or replacement pitched roofs the ideal build up would be insulation fitted over and then between the rafters giving a big boost for airtightness image credit. For the same reason insulation shouldn t touch the roof s underside.

There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam. It should be installed on tapered 2x furring strips in order to slope the surface of the roof to drains. There are several different methods for insulating roofs and walls alike but with a flat roof you have to worry about water getting in. Suitable for use with all roofing membrane materials eps roof insulation is compatible with loose laid and attached single ply membranes conventional built up roofing or modified bitumen systems.