Roof Ridge Width

Newport vt felicia before you can determine the size of the roof framing members for your cottage s gable roof you will first need to decide if you are going to use dimensional lumber i joists engineered lumber or some.

Roof ridge width.

Ridge boards and beams. Ondura 12 5 in x 39 5 in cellulose fiber asphalt roof panel ridge caps. For 2 x 6 rafters use a 2 x 8 ridge board and so on. Galvalume uses an alloy of 45 zinc 55 aluminum to create an extra durable coating that is ideal for ridge capping a galvalume panel roof.

Choose a ridge board that is one size larger than your common rafters. For 2 x 4 rafters use a 2 x 6 ridge board. The ridge cap used in conjunction with closure strips reliably protects the ridge seam against water infiltration. The finished ridge beam height z above the top of the wall will be m plus the y height.

The top end of each rafter is cut at an angle so that it meets flush with one broadside of the ridge board and the ridge is sandwiched between the rafters. The gibraltar ridge cap is made from sturdy 29 gauge galvalume steel. Determining the ridge beam height. If you know the slope x in 12 you want to use for your roof framing design you can use it along with the run r to determine the height of the ridge beam for example if the slope is 4 in 12 and the run is 12 feet the ridge beam height m will be 4 feet.

The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. In traditional house framing also called stick framing a basic roof frame consists of opposing pairs of sloping rafters that meet at their top ends at a ridge board or ridge beam.