Stucco & Exterior Walls in San Dimas
Foam trim bands look like plaster but burn. Fernhill Builders swaps them for cement-based trim in the same profile on San Dimas stucco walls.
Foam trim bands around windows look like plaster, and underneath they are polystyrene, which softens in heat and burns. On a San Dimas stucco job, the material swap Fernhill Builders proposes first is cement-based trim in the same profile. It keeps the shapes of the house, takes the same finish coat and removes a combustible material from the face of the wall.
What gets swapped and what stays
Foam shapes are cut off and replaced with cement board or plaster built up on lath to the same profile. Sills, bands and window surrounds keep their outline, and the new surface is textured to match the field. Wood trim that touches plaster is checked for rot and replaced with fiber cement where it is past saving. The existing color is sampled before work so new trim and old wall read as a match. Cement shapes can be cast or built up in place, which keeps the lines of the house the same.
Why heat matters at the trim
Trim projects from the wall, so radiant heat and drifting embers reach it first. A combustible band can carry flame up toward a window, eave or vent. Dual-pane glass and tight eaves do less when the material next to them burns. Replacing trim is a small share of a stucco scope, yet it removes a path that plaster alone cannot close. A cement band, by contrast, softens nothing and feeds nothing, which is the point of the swap. Cement-based trim also takes paint or a color coat like the walls.
Stucco & Exterior in San Dimas: common questions
The field can be stucco on metal lath or fiber cement boards, and the trim has to match it: cement-based shapes, fiber cement boards and metal flashing. Foam and bare wood bands weaken the build, so the scope calls them out and names the replacement.
Patch when the plaster is firm and the trim is already cement-based. When foam trim is cracked or loose, stripping that band and the plaster around it is the cleaner repair. A test cut under the trim shows whether water has reached the sheathing.
Planting and soil are trimmed back, the weep screed is cleaned or installed, and an untouched gap sits under the plaster edge. Foam or wood trim that runs down to the ground is cut off above the screed and replaced with cement board, which leaves the base line open.
More work we do in San Dimas
Plan your project in San Dimas
Tell us about the house and the stucco & exterior work. We reply about a walk-through and a written scope.