Vertical strapping at eaves pitched roofs.
Rafter ties needed for cinder block with hip roof.
As roof pitch is lowered the weight burden on the rafters increases.
Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come.
If the wall is built from hollow concrete blocks a minimum anchor depth of 400 mm is required for heavy roofs and generally 600 mm for light roofs.
Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps.
Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same.
In a roof that is significantly unsymmetrical or mono pitched alterna tive means of catering for the horizontal thrust may have to be found.
Attaching a wood roof to a cinder block building is difficult but possible.
On each side of the roof are cancelled out.
Its not just a frieze block anymore its holding up some weight.
Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results.
For low pitch roofs building codes may require larger dimension rafters.
Adding fasteners to existing straps shall be allowed in lieu of adding a new strap.
This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home.
If the block wall comprises either a 140 mm or 190 mm single leaf and it spans about 8 m then the anchor must be embedded at 1000 mm into the blockwork.
Collar ties these create the same necessary structural triangle but do it a little higher up on the rafter.
Discover the pros and cons to multiple roof designs.
Failure to create an attachment point will result in roof failure especially in high winds.
However the do it yourselfer can attach a wooden roof to cinder block with little or no training in one to two days depending on the size and scope of the project.
The hip rafter the hip girder and the rafters trusses adjacent to the hip girder that are not anchored with a strap having at least four fasteners on each end shall be connected to the concrete masonry wall below using approved straps or right angle gusset brackets with a minimum uplift capacity of 500 lbs.
For instance if your roof has a steep pitch you may be able to use 2 inch by 4 inch rafters but if your roof has a low pitch building code may require that you used 2 inch by 6 inch or 2 inch by 8 inch rafters.
Each strap should be fixed as shown in the diagram opposite with noggins between the rafters to support the metal strap along its whole length.
Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries.
Some of that load will be transferred down to wall at the bottom of the hip rafter and some to the ridge the hip is definitely carrying a load and so is the ridge now that its a hip roof it is carrying what has been transferred by the hip rafter.
