How To Insulate A Flat Roof Externally

To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity. Flat concrete roofs are generally not ventilated since the ceiling internally is generally a plaster and skim coat directly to the underside of the cold concrete. Creating a void between the old ceiling and new is better but ideally you need to eventually consider insulating the top of the concrete roof with solid insulation and a better covering grp or epdm.

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It should be installed on tapered 2x furring strips in order to slope the surface of the roof to drains.

How to insulate a flat roof externally.

Insulation material is placed on top of the roof rather than in between the ceiling and the decking. 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. The target should be to achieve a u value of 0 25w m2k or better. The typical u value of an existing uninsulated flat roof is 1 5w m2k.

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. Proper ventilation in flat roofs. When a homeowner really needs to cut down on costs some contractors may suggest the following.

It also lets hot air escape in the summer. With a warm roof the usual process is to split the insulation into two layers. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses. Ventilation is necessary to allow moisture accumulated inside to escape.

Add an additional layer of osb over the sheathing. The material that works best depends largely upon preference in a given situation. Insulation is placed in between the joists underneath the roof surface above. You would only do this however if replacing the roof covering on top and you have the height above the roof to do this.

If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. It should be of the maximum available thickness.

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