Rafter Ties Needed For Cinder Block With Hip Roof

In a roof that is significantly unsymmetrical or mono pitched alterna tive means of catering for the horizontal thrust may have to be found.

Rafter ties needed for cinder block with hip roof.

For low pitch roofs building codes may require larger dimension rafters. Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Effective strapping at gable wall.

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. Vertical strapping at eaves pitched roofs. Failure to create an attachment point will result in roof failure especially in high winds. 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.

Discover the pros and cons to multiple roof designs. They do not have to be installed at each rafter pair and add visual interest when the roof structure is open to the room below. 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. 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.

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. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. Adding fasteners to existing straps shall be allowed in lieu of adding a new strap. 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.

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. Attaching a wood roof to a cinder block building is difficult but possible. Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. B 1 cut roofs detail b 1 1 2 spans detail b 1 1 1 transfer of load where raised ceiling ties are used in a roof the roof must.

Collar ties these create the same necessary structural triangle but do it a little higher up on the rafter. On each side of the roof are cancelled out. As roof pitch is lowered the weight burden on the rafters increases.