Step-by-Step Instructions and Pictures: Tips For Framing Walls In New Construction

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You have to toenail the bottom of the cripples to the header. Window openings are just like doors but with the addition of a rough sill. Mark the top of the sill by measuring down from the header. Use the rough opening height for this dimension. Cut the lower cripples and place one under each end of the sill as a temporary support while you toenail the sill to the trimmers with a pair of 8d nails at each end. Align the cripples with the layout marks and nail through the sill and bottom plate to hold them in place. Use pairs of 16d nails. Some carpenters like to double the rough sill, especially on openings wider than about 3 ft. If you do this, remember to allow for the thickness of a double sill when you cut your cripples.