A new roof e g.
Warm pitched roof construction details building regulations.
Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation.
Resist the spread of fire from one property to another.
The regulation recommends the use of robust details as produced by the building research establishment including the elimination of gaps cold bridges sealing around pipes and other penetrations in areas of high humidity and a maximum u value of 0 35 w m k at any point in the roof construction.
This usually keeps the deck warm.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
Insulating a pitched roof above the rafters is the common method chosen for new builds and re roofing existing detached buildings as it provides superior thermal performance for the building.
It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction.
Pitched roofs overview.
New roofs weight loading advertisement.
In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
Be able to support loads weights provide resistance to heat loss insulation be ventilated to protect from condensation in most cases have adequate drainage.
Having a manual for warm flat roof construction with details and a summary of rules to follow helps.
New roofs thermal resistance insulation there are two ways to insulate a roof.
Pitch roof u value 0 16 w m2k 2 warm deck pitched roof the insulation is placed over the rafters and then a felt is placed on top.
When used in roofs tyvek and airguard membranes provide optimal protection of the thermal insulation and reduce the risk of interstitial condensation enhancing the energy efficiency of the building.
Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building.
For additional stability you can also use steel joists that are built into one or both of the walls.
The battening and tiling is then fixed down over.
Roof pitch is a measurement of a roof s slope expressed as a ratio.
Warm roofs have an insulation layer above the roof deck.
Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.
Warm cold roofs.
The function of a roof is to protect the building below from the weather.
Due to their breathable nature tyvek membranes offer benefits over traditional impermeable roofing underlays commonly used in warm pitched roof construction by reducing the risk of interstitial condensation occurring within roof constructions.
