Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.
Cold roof insulation between joists.
It allows insulation to be added without having to replace the waterproofing on.
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.
Poly to the underside of joists.
Cold roofs by the way are not recommended for high humidity areas see the blog on how to insulate.
You only need ventilation in a cold roof.
The insulation is below the deck but above the plasterboard.
In this way the roof itself is kept cold.
There is only a small gap between this ceiling and a concrete roof cold roof felt covered.
I intend to fill between my joists with foil backed insulation board 75mm with a thin layer of insulation on top of the 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.
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 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.
This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system.
Improving your home s energy efficiency rating.
I ve built a timber frame to support a new plasterboard ceiling below the existing one.
No insulation is on top.
A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck.
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.
In this context the term hybrid flat roof refers to a timber flat roof construction that is insulated both between and over the joists.
Great videos thanks for sharing.
Increasing your home s value.
2d extend insulation into joist space to reduce air flows.
Ventilation is required for these roofs.
A cold flat roof is one where the insulation is between or between and below the roof joists.
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.
This is used for refurbishment e g.
Refurbishing an existing timber joisted flat roof which has no insulation.
Other benefits of roof insulation include.
