Hidden Hills Windows & Doors and What Lies Beneath
Rot under old thresholds and hollow door cores are found before new doors and windows are ordered for an older Hidden Hills house, ember rules included.
Rot under a door threshold is a hidden condition an older Hidden Hills house can carry for a long time without a mark on the floor. Water slips past a worn sweep, soaks the subfloor and works into the rim joist below. When lifting the threshold shows soft wood, the framing is repaired first, and the door is measured and ordered only after the rebuilt opening is square again.
Lifting the threshold
With the threshold off, the subfloor is probed across the whole opening and a short way into the room. Decay that stops in the plywood is cut out and replaced with a new panel glued and screwed to the joists. Decay in the rim joist means a length of rim is replaced, with shoring under the wall while it is out, and the joist ends nearby are checked as well. A sloped pan with turned-up back and end dams goes in before the new threshold, so the repaired floor stays dry from then on.
What an old door is made of
Where a Hidden Hills lot sits inside a mapped fire hazard zone, it may face ember-resistance rules for each new door and pane. Paint can hide how an older exterior door is built, and a hollow core or thin panels would fall short of those rules, which call for a solid core of adequate thickness, a noncombustible face or a fire-rated slab. We look at the hinge edge, where the construction shows, before deciding whether a door can stay. Replacement glass on such a lot is ordered as dual glazing with a tempered layer.
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Probe before deciding, since paint hides soft wood. Firm wood at the sill and bottom rail lets us restore the sash and keep its original glass, though on a lot within a mapped zone a pane broken later may need tempered glass. Rot that has spread into the frame, or joints that have pulled open, point to a replacement built to match.
The casing sets the pattern. One piece comes off intact so its profile and width can be recorded, the rest stays put, and the new units are built to the old glass size and bar layout. Where ember rules apply, tempered dual glazing can still carry slim bars that follow the original lines.
Hidden Hills is an incorporated city, so the permit goes through the building office that serves it. That review checks energy labels on new units, and where the lot falls within a mapped fire hazard zone, it checks glass and doors against the ember rules too. Subfloor and rim repairs found at a threshold go on the same permit.
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