Cold Roof Insulation Between Joists

I intend to fill between my joists with foil backed insulation board 75mm with a thin layer of insulation on top of the joists.

Cold roof insulation between joists.

In this way the roof itself is kept cold. You only need ventilation in a cold roof. Alternatively battens can be secured to the underside of the. I ve built a timber frame to support a new plasterboard ceiling below the existing one.

In this context the term hybrid flat roof refers to a timber flat roof construction that is insulated both between and over the joists. There is only a small gap between this ceiling and a concrete roof cold roof felt covered. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. Warm and cold roofs for insulation purposes.

2d extend insulation into joist space to reduce air flows. Poly to the underside of joists. Improving your home s energy efficiency rating. Cold roofs by the way are not recommended for high humidity areas see the blog on how to insulate.

A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. Insulation between the joists keeps warmth in your living space below and creates a cold loft while insulation in the rafters allows you to keep warmth in the roof space as well. As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof. Guidance advice on.

This quetion is to do with warm roofs and cold roofs presumably the 50mm of insulation on the underside of joists would act as the vapour barrier if taped sealed correctly or if insulation between joists a vapour barrier i e. Easily the most frequently asked question to the celotex technical centre is with reference to hybrid flat roofs. It allows insulation to be added without having to replace the waterproofing on. Ventilation is required for these roofs.

Other benefits of roof insulation include. Refurbishing an existing timber joisted flat roof which has no insulation. Increasing your home s value. This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system.

Great videos thanks for sharing. A cold flat roof is one where the insulation is between or between and below the roof joists. This is used for refurbishment e g. No insulation is on top.

Where insulation depth is restricted by the flat roof construction it may be necessary to install the roof insulation between and below the joists to create a cold deck structure.