Fabulous Rough Opening For Windows In Concrete
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Set it temporarily so that it rests on the top edge of the window and mark the position of the flashing s top edge in the foam.
Rough opening for windows in concrete. It should have a dam on each end and a drip edge along its bottom edge. Prepare metal flashing to go over the window. The rough openings in a structure are necessary during the construction of the structure. If the size of the window needs to be reduced more than 3 inches it s best to frame in the opening and add sheathing.
Spread maxflash evenly creating a continuous void and pinhole free flashing membrane with a thickness of 12 30 mils. Normal shim space can be as small as 1 4 inch to as large as 1 inch on either side of the opening. Apply a thick bead of maxflash in a zigzag pattern to the rough opening and onto the exterior wall. B ensure proper header is in place before.
For example if you need to make the height 1 2 inch smaller rip down a 1 2 inch strip of plywood and install it on the sill. The rough opening is the full untrimmed opening for a window or door. If you need to reduce it by 1 inch than add two strips of 1 2 inch plywood etc. Spray foam alone can handle 150 mile an hour cross winds that s 25 miles an hour more than just screws.
Install window in the flashed opening and leave adequate space all around the window for insulation. It is imperative that the framer mason concrete sub etc. Ensure that the rough opening is plumb level and square and the walls in the opening are not twisted. For standard wood framed construction the rough openings for doors and windows is typically the actual unit size plus 2 1 2 inches in height and width.
If you re going to frame a rough opening for a door then you ll need to know the unit size. Its width should match that of the rough opening. The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide. See figures 2 6.
Build a wood casing screwed to the concrete opening. Add a 1x board if you need to decrease the size by 3 4 inches. A 1 1 2 38 mm solid blocking is required at the sill and sides of the opening. Along this mark cut a shallow horizontal slot in the foam face and push the top edge of the flashing into the slot.
Apply a bead of maxflash to each corner of the rough opening between wood bucks and masonry and between wood bucks. For example let s say we want to frame a 6 8 x 3 0 front entry door. Flash the entire wood casing using the proper primer. See figures 1 5.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide. No use some round backer rod and place that around all four sides on the exterior and then caulk the window to the concrete with backer rod preventing three way sealing or attaching of the caulking. The best way to fill in a window rough opening is by installing additional lumber boards. Frame the bottom shelf with an angle so that the water striking the window will run away from it.
As per the 2014 alberta building code part 9 7 windows must be installed using the csa 440 installation standard which requires sill protection.
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