Insulating Existing Concrete Flat Roof

Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.

Insulating existing concrete flat roof.

This is used for refurbishment e g. To produce a hot roof rigid insulation is fitted outside above the weatherproofing. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. Green roofs a green sedum or grass roof can also be put onto a flat roof provided it can take the weight.

A cold flat roof is one where the insulation is between or between and below the roof joists. How to insulate a flat roof. The existing ceiling is sound but provides no insulation. Insulation is placed in between the joists underneath the roof surface above.

Cold roof a very bad idea. I ve built a timber frame to support a new plasterboard ceiling below the existing one. The insulation is below the deck but above the plasterboard. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation.

I want to insulate below a flat roof without removing the existing ceiling. There are many different types and installation methods out there along with a lot misinformation about which products offer the greatest energy savings. Gable roofs hip roofs intersecting roofs butterfly roofs mansard. Insulation material is placed on top of the roof rather than in between the ceiling and the decking.

Both these variants require different approaches to insulation which will be covered in this guide. Roofing insulation is one of the most important and misunderstood building components. Refurbishing an existing timber joisted flat roof which has no insulation. There is only a small gap between this ceiling and a concrete roof cold roof felt covered.

Roof types the various types of roofs found on homes sheds garages and other buildings fall into one of the following categories. With an inverted warm roof construction put ballast usually graded pebbles or concrete paving slabs on top of the insulation in order to keep the insulation down in the event of wind. Here we share the most common mistakes people make when installing flat roofing insulation. To insulate a flat roof with a concrete deck we recommend a warm deck construction method where the vapour control layer is sandwiched between the concrete deck and a layer of rigid pir insulation boards.