Chimney Caps and Crowns in Norwalk, CA

Chimney Caps and Crowns for Norwalk Homeowners

Norwalk went from farmland to a city of tens of thousands inside a single decade. The tracts that went up through the 1950s were built quickly and to a price, and the chimneys reflect that: light masonry stacks on shallow footings, tile-lined, with minimal crown detail and no cap as standard. Seventy years on, the most common thing we find on a camera survey here is displaced flue tile. Some of that is seismic, but a good deal of it is simple differential settlement on ground that was agricultural before it was residential and was not always prepared as thoroughly as it would be today. A chimney is a heavy, rigid column attached to a light flexible house, so when the ground under one corner moves, the stack is where you see it. Look for a gap opening between the chimney and the wall of the house, or a stair-step crack in the mortar joints. Neither is necessarily an emergency, but both mean the flue inside has almost certainly moved too.

Rapid 1950s tract construction on former farmland, with differential settlement showing as displaced flue tiles and separation cracks.

An uncapped flue in Los Angeles County is an open pipe into your house, and it fills up. We pull nesting material out of chimneys here in every month of the year, because the birds and roof rats never get a winter off. The other thing an open flue takes is rain, straight down onto the damper and the smoke shelf, which is why so many dampers in this county are rusted solid. The crown matters just as much and gets thought about far less. A crown is meant to be a sloped, reinforced slab with an overhang and a drip edge that throws water clear of the brick. What most houses actually have is a flat trowelled smear of ordinary mortar, which cracks within a decade and then funnels water into the top of the stack. There is a fire dimension too: in the hillside and canyon parts of this county a spark arrestor screen is not optional, and a great many older chimneys either never had one or have one that has rusted through.