Cement Door Sill Repair

Cut the new door sill to size and bevel the outer edge.

Cement door sill repair.

If i raise the concrete pour mounting the sill i might be able to cantilever and extend the lip of the sill about 75 1 into the air over the exterior brick landing. Slide the threshold underneath the doorstops and position the notches you cut around the door jambs. Paint or stain the new door sill. Remove the old door sill from beneath the door frame.

There are a number of weatherproofing issues we need to address but the most urgent is the concrete sill under the door which has been crumbling for a while and presumably is the source of our leak. Remove dirt and debris from chips and hairline cracks in the concrete threshold using a stiff bristle cleaning brush. Lift the threshold out and drill 1 1 2 inch deep holes at each drill tip mark on the concrete. The aluminum door threshold should sit level on the sill and join to it with a waterproof flexible and adhesive sealant polyurethane.

If it prevents the door from closing comfortably you can plane down the door or lower the threshold. Fit the new door sill in place under the door frame. Cut it with a hacksaw. Install a cover alone or purchase a cover and sill combination.

Hold the new door sill in place with construction adhesive and fasteners. Caulk around the outside of the door sill. Remove all debris from the concrete slab. Tap it snugly into position using a rubber mallet.

If it fits apply liquid nails glue to the concrete and attach the threshold. Position the old door sill on the new sill and trace around it. When the saddle is in place restore the door jamb adding calk so that it fits nicely. Drive a new 3 16 by 1 inch concrete anchor into each of the holes with a hammer.

We ve been having some issues with water leaking into our basement under our front door. If there s carpeting trim the carpet where frayed material hangs loosely. If desired protect and liven up a sill with a metal sill cover which wraps around the front of the sill. Then test the threshold for fit.