There are several variables to consider when determining the proper rafter size.
Patio deck roof pitch requirement.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
All hardscape within 10 feet of a building must slope away from the building with a minimum slope of 2 percent.
That means that the patio must slope away from your house at least 1 4 inch per foot for at least the first 10 feet from the house exterior.
You can raise the patio roof up to 500 millimeters by removing the eaves fascia and gutter.
The roof will be constructed using multi core galvalume metal roofing.
The posts will be attached to the slab using.
Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
The back channel is connected to the rafter directly and reinforced.
This meant the patio cover could start at the edge of the house s roof at a height of eight feet and slope down to seven feet leaving a clearance of more than six and a half feet between the lowest part of the frame s headers and the ground at its outer edge.
A deck that projects 9 feet out from the house needs to slope 1 8 inches from the house to the farthest edge for.
Building a patio cover a free standing example.
This sizing guide for roof rafters will help determine what you need for your small project.
The figures are based on quality materials.
As such a patio falls under the irc recommendations on grading and drainage.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.
Use the divided measurement as the total amount of slope for the deck in inches.
Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.
The tables below give maximum spans for rafters and beams.
Minimum roof slope roof pitch r905 3 2.
Using corrugated metal also allows me to reduce the degree of slope or roof pitch needed to a mere 10 percent or a 1 to 10 pitch.
