How To Tie Two Gambral Roof Together

Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area.

How to tie two gambral roof together.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. The framing required at the intersection of two roof lines is easy to. Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush.

Draw a complete plan of how the roofs will fit together before even starting the project. Nail osb or plywood onto the rafters to enclose the roof. A gable roof is fairly simple geometrically but when two gable roof lines intersect the geometry gets more complicated. Also most gambrel roofs require a kneewall to support the knuckle or the joint between the upper and lower roof slopes.

Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof. As every roof is unique you will need to plan for each type of roof addition project that you undertake. Nail along the edges of the osb or plywood driving the nails into the rafters every 8 inches 20 cm with 8d common nails. Once the new roof is fitted you can then start to add the rafters and build up the new roof in the normal fashion.

Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. Start with the top corners of the roof first. We simply slid the straightedge over until it hit the shed roof and then positioned a 2 by under the straightedge and marked the edge of the 2 by. The work is cumbersome and when you re done this kneewall takes away from the available floor space below the gambrel.

Use long roofing nails to do this and apply a coat of roofing compound in the gaps and on all of the nail joints. Plywood will be mounted over the rafters and then your roof covering of choice can be used. You have to build the kneewall first then brace it straight and work around the wall and its braces while installing two sets of rafters. Give special consideration to the two roofs and how they will work with one another.

We did this at the top and bottom on both sides of the roof and connected the marks with a line which gave us the placement for the blind valley sleepers. A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof.