New zealand metal roofing manufacturers inc.
Minimum roof pitch nz.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
It is corrosion and fume resistant econom ical requires only simple tools for fixing and its flexibility and light weight gives planning and design freedom over many other roofing materials.
The new zealand roof and wall cladding code of practice has been written for new zealand conditions that.
Minimum pitch the minimum roof pitch for corrugate is 8 degrees approx 1 7 and if end lapped 10 degrees approx 1 6.
The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
The nz metal roof and wall cladding code of practice also recommends increasing the minimum depth of the valley gutter to 75 mm where the roof pitch is between 8 12.
However after seeing issues of water ponding as roofs settle over time the metal roofing industry changed this in the 1970 s to a minimum pitch of 3 for all coated steel and aluminium products.
Roofing horizontally and vertically laid cladding.
The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Longer lengths require specific design.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Downpipe for catchment over 50 m.
When a combination of sheets provide a run of in excess of 40 metres and up to 60 metres the roof pitch should be increased by 1 degree.
Raising the minimum roof pitch of all coated steel and aluminium products gives enough tolerance to avoid roof deterioration and ensure the roof dries meeting the minimum 15 year durability requirement of the nzbc.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems.
Auckland whangarei hamilton tauranga palmerston north new plymouth hastings wellington christchurch cromwell.
However it is regrettable that many installers usually ignore this requirement due to the desire for a quick installation process.
