Chimney Caps and Crowns in Rancho Palos Verdes, CA

Chimney Caps and Crowns for Rancho Palos Verdes Homeowners

Rancho Palos Verdes is the most demanding place we work and the one where a chimney is least likely to be ordinary. The housing is largely 1960s and 1970s custom and semi-custom hillside building, with tall architectural stacks on steeply pitched roofs, often exposed on three sides. Three local conditions drive everything. The first is marine exposure: fog, salt and wind coming straight off the water, which corrodes any ferrous metal at the top of a stack and keeps masonry damp far longer than it dries. The second is wind loading on those tall exposed chimneys, which is why caps here must be mechanically fixed rather than friction fitted. The third is ground movement, and it is not historical: the Portuguese Bend landslide complex is active, and in the affected areas structures are being sheared continuously rather than in single events. A chimney in a moving zone will crack again after it is repaired, and we would rather tell an owner that plainly than take money for a repair that will not hold.

Tall exposed 1960s-70s hillside stacks, heavy salt and fog corrosion, high wind loading, and active land movement at Portuguese Bend.

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.