Compare Who Caulks the Window Trim When the Roof Is Done

When a crew finishes a reroof in St. Louis, everyone looks at the shingles. The window trim is the part that quietly decides whether water stays out at the wall. Where a new roof meets a wall, the crew lifts the shingles and the step flashing. The head flashing sits above the windows that fall under the roof edge, and the sealant that holds the trim to the wall has to be checked or redone. Two bids can both say new roof and still disagree about whether anyone touches that sealant.

This page is about that one line in each bid. It is not about the shingle brand or the price per square. It is about who flashes, who caulks, and who answers for the joint if a window head starts to stain the drywall a year later.

Roofer comparison

Start by reading each proposal for the words around the windows. Many bids list drip edge, starter, ridge cap and underlayment in detail and then stop at the wall. Others say flashing will be replaced at walls and penetrations without saying which flashing, or whether the trim caulk is included. A line that says flashing replaced is not the same as a line that says head flashing lifted and reset at each window under the roof edge, with new sealant at the trim.

Ask each roofer three things in plain language. Which windows sit within reach of the roof work? Will the crew lift and reset the head flashing, or cap over it? Who applies the sealant at the trim, and what product is it? Keys Roofing puts a written scope with photos and measurements in the homeowner's hands, so you can check each answer against the other bids before anyone signs.

Look at the wall above the roof edge too. Where a roof runs into a taller wall, the wall usually needs counterflashing or a kick-out so water is directed away from the trim and not behind it. A bid that never mentions the wall is leaving that detail to the crew on the day, and that is a different kind of promise than a written one.

Pay attention to the schedule. Sealant needs dry surfaces and air temperatures that the product label allows, and in St. Louis that window can close quickly in late fall. A bid that pushes the trim work to the end of a long job may leave an open joint through the first hard freeze. Freeze and thaw cycles work on caulk every winter, and a joint that was never fully bonded will show it first at the corners. A bid that does the trim on the same day as the flashing has one crew responsible for both, which makes it easier to ask who fixes a problem.

If the roofer says the trim belongs to a siding or paint contractor, ask for that contractor's name and whether they have been told the roof date. A gap between two trades is where a window head can stay open for weeks while each side assumes the other has it.

What it costs

Window trim work rarely shows up as its own price. It sits inside the roofing total, or it is left to another trade, or it is left out entirely. That is why two totals can differ by a few hundred dollars without either roofer saying anything untrue. One total covers the flashing and the sealant. The other covers the shingles only, and the homeowner is left to find the rest.

When you compare totals, mark every line that touches the walls. Head flashing, step flashing at the wall, counterflashing where the wall is brick, and sealant at the trim should each have a line or a clear note. If one bid has no line for them and the other does, the gap is not a discount. It is a different job.

Do not treat trim work as an add-on to the shingles. Compare it as a separate line that either exists in the proposal or does not. A bid that says included in the roofing price still needs to name what is included, because a sentence like that can hide a missing step.

Ask whether the trim sealant is a unit price or a lump sum. Some roofers price window trim per window. Others fold it into the square count with no separate number. A unit price lets you see what one window costs if another is added later, or if one window needs a second look after the first heavy rain.

Also ask what happens when the old trim is brittle. Old trim can crack when the crew lifts it, especially where paint has built up over the nails. The bid should say whether replacement trim is included, whether it is priced separately, and who decides before a cut is made. A written rule for that moment is worth more than a promise to be careful.

What to ask

Bring this list to every roofer you compare. Each answer should be a line you can point to in the written proposal.

1. Which windows and doors sit under the roof edge, and which of them does the new roofing touch?
2. Will the head flashing be lifted and reset, or capped over?
3. Which sealant is used at the trim, and does the bid name the product?
4. Is trim replacement included if the old trim cracks on removal, and at what price?
5. Does the crew seal the trim on the day the flashing goes in, or on a separate visit?
6. Who looks at the trim after the first heavy rain, and how do you reach that person?

Ask for the answers in writing. A verbal yes at the door does not carry the weight of a line in the proposal, and a roofer who says the trim is handled should be able to show where in the scope it is written. If a roofer cannot point to the line, the answer is not yet part of the job.

Keys Roofing can be reached at (314) 220-2333 if you want to talk through the scope for your own windows before you compare it with another bid. Bring the proposals you already have, and ask each contractor the same six questions so the answers line up on one page.