Warm deck insulation 1.
Flat roof insulation above and between joists.
This is used for refurbishment e g.
Here the roof deck is maintained at the same temperature as the internal conditions hence warm deck roof.
Here the roof deck is maintained at the.
The loft space can be used as a habitable room.
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.
If you put insulation under the decking and between the joists you lower the temperature of the decking and lower the due point thus bringing it closer to the danger point of being in the building.
Flat roof detail masonry cavity wall flat roof insulation above and between joists.
Parapet detail masonry cavity wall flat roof with parapet insulation.
Flat roof detail examples.
Bs 5250 2011 the british standard for the control of condensation in buildings does not recommend installing insulation between timber joists as well as above the deck.
A cold flat roof is defined by insulation being installed between and if necessary underneath the timber joists.
How to install insulation in a flat roof with timber deck insulated above the joists.
Flat roof detail masonry cavity wall flat roof insulation above and between joists.
It is also suitable for retrofit with a substantial renovation of the roof.
Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation.
An over and between rafter insulation solution can be a feature of a new build project.
The roof itself is therefore kept warm.
Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle.
The insulation is below the deck but above the plasterboard.
A cold flat roof is one where the insulation is between or between and below the roof joists.
A warm flat roof is defined by insulation being installed on top of the roof deck.
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.
Refurbishing an existing timber joisted flat roof which has no insulation.
A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck.
By majority the rule of thumb is that in a domestic house not flats approximately a third of the total thermal performance of insulation can be placed below the deck with two thirds above.
Set the quinn therm qrfr ply insulation boards onto a wide 30mm bead of vapour resistant sealant applied to the upper surface of all the joists and cross noggins.
