Cold Roof Insulation Between Joists

Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

Cold roof insulation between joists.

Guidance advice on. A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. No insulation is on top. I intend to fill between my joists with foil backed insulation board 75mm with a thin layer of insulation on top of the joists.

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. Refurbishing an existing timber joisted flat roof which has no insulation. Improving your home s energy efficiency rating.

This is used for refurbishment e g. This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system. In this context the term hybrid flat roof refers to a timber flat roof construction that is insulated both between and over the joists. Ventilation is required for these roofs.

There is only a small gap between this ceiling and a concrete roof cold roof felt covered. Warm and cold roofs for insulation purposes. I ve built a timber frame to support a new plasterboard ceiling below the existing one. 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.

In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. You only need ventilation in a cold roof. 2d extend insulation into joist space to reduce air flows. Poly to the underside of joists.

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. Increasing your home s value. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. In this way the roof itself is kept cold.

Alternatively battens can be secured to the underside of the. Great videos thanks for sharing. 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. Other benefits of roof insulation include.

The insulation is below the deck but above the plasterboard.