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Traditional
This method relies entirely on the skills of the installer to
be able to form the soft copper using hand tools. Traditionally
the panels were fabricated out of sheets that were no longer than
1.8m. Traditional systems can utilise 'Battern Roll' and 'Standing
Seam' methods of fabrication. Installation of the 'Battern Roll'
jointing method allows copper roofs to be installed below 5 º.
With 'Standing Seams' the pitch of the roof needs to be over 7º.
Long Strip
The 'Long Strip' system came into the UK during the 1950's, with
this system a lot of the hand work has been removed and so offers
reductions in labour costs. By using a harder temper copper the
roof sheets can then be formed by machine up to 10m in length
without any of the transverse joints found on traditional systems.
Long Strip panels can only be installed on roofs with pitches
over 7º.
Ventilation
Copper is not affected by underside corrosion which can cause
metal roofs to prematurely fail, which also means that copper
roofs do not require elaborate ventilation systems.
When installing copper on a warm roof construction adequate vapour
barriers need to be installed along with enough insulation to
reach the required U values.
For ventilated or cold roofs the ventilation is provided by air
gaps to the eaves and ridges.
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