Take note of this measurement, as this will be the first number in the size pergola you choose. To calculate your Rafter Length for a freestanding pergola, it is Measurement A + 3′. The freestanding Big Kahuna has a 1’6″ overhang past the outside edge of the post on each side for a total overhang of 3′. Then, add the overhang to that measurement. Using a tape measure, pull your first measurement from the spot where you would like the outside edge of one set of posts, to the spot where you would like the outside edge of the other set of posts to land. The length of rafters (also referred to as “Depth”), will be calculated by measuring the distance you would like to have between the outside of the posts, plus the overhang. Measurement A + Beam Side Overhang = Rafter Length (Depth) for Attached Pergola Determine Rafter Length (Freestanding Pergola)įor a freestanding pergola, the difference is that the Rafter is not attached to a wall, so there is overhang on both sides. (In our example showing a 13’x19′ Big Kahuna attached pergola, this calculation would be: 11’6″+ 1’6″= 13′ = Rafter Length of 13 feet). To calculate your Rafter Length for an attached pergola, it is Measurement A + 1’6″. The attached Big Kahuna has a 1’6″overhang past the outside edge of the post. Using a tape measure, pull your first measurement from the wall (where the pergola will be attached) to the spot where you would like the outside edge of your posts to land. The length of rafters (also referred to as “Depth”), will be calculated by measuring the distance you would like to have from the wall to the outside of the posts (for attached), plus the overhang. Determine Rafter Length (Attached Pergola) Once you have an idea of the location and amount of space you plan to use, now you can take measurements to determine the actual size kit that you will be ordering. The inside area is always a bit less as explained above. The overall dimensions of our pergolas determine the size of the roof structure. Look at the space you have and consider how much room you would like inside the posts and under roof. and you may want a specific size roof structure to provide for the most coverage that your space will accommodate. How much useable space would you like inside the posts or between the wall and posts, and how much overall roof coverage would you like to achieve? You may need a specific amount of space inside for patio furniture, planter boxes, outdoor kitchen components, a hot tub etc. Will your pergola be attached to your house (or other structure) or will it be standing alone on an existing or to-be-built patio? Some customers prefer not to attach the pergola, but install it freestanding immediately next to the house or other structure.
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