Your roofer has looked at the house after hail, but the detached garage is still a question. Its shingles look older, there is no ceiling stain to point to, and you are deciding whether to include it in the work. The useful fact is this: sharing a yard and a storm does not make two roofs the same repair job. The garage needs its own assessment of the covering, the wood beneath it and the places where water can enter.
That matters on St. Louis properties where a detached garage sits behind the house, sometimes with access from an alley. The house may have been reroofed while the garage kept its old three-tab shingles. One roof may have open attic access; the other may have plywood visible between the rafters. A proposal that treats both buildings as one quantity can hide those differences before you have decided what either roof needs.
Storm and hail: look at the garage as a separate roof
Start by establishing what is actually on it. Ask the roofer to identify the roof covering, inspect both slopes where accessible and describe its condition separately from the house. A garage with asphalt shingles calls for a different assessment than a garage with a low-slope membrane. Even two shingle roofs can differ in age, brittleness, previous repairs and the number of existing layers.
Hail marks on the house do not establish the condition of every shingle on the garage. Nor does an apparently untouched house settle the garage question. The inspection should identify what was found on each building, where it was found and whether it affects the proposed work. Ask for photographs labeled by building and roof slope. A close-up without that location can become surprisingly unhelpful when you are comparing two separate repair decisions.
Wind exposure can also differ across the property. The garage might stand beside an open alley while the house has another building close to it. That is a reason to inspect the garage, not a basis for declaring damage from the ground. Missing shingles, displaced edge metal and loose material deserve attention, but the repair recommendation should rest on the roof's actual condition.
An unfinished garage can reveal water without a ceiling stain
If the garage has exposed roof framing, look upward from the floor in daylight. You may be able to see dark marks on the underside of the decking, wet wood or water tracking down a rafter. Note where you see them relative to the overhead door and side walls. That gives the roofer a location to compare with the roof above.
A dark mark alone does not establish an active leak or tell you which storm caused it. Old leaks can leave marks after repairs. Moisture can also have more than one source. Tell the roofer whether you saw dripping during rain, whether stored items became wet and whether the mark changes after another rainfall. Do not climb onto shelves or walk on ceiling framing to get closer.
A finished garage needs a different approach because drywall conceals the underside of the roof. The absence of a visible stain is not a complete inspection. Ask how the contractor will assess the accessible roof surface and any available attic space, and what will remain concealed until work begins.
An older garage roof may not tolerate the same repair
Replacing a few damaged shingles requires working around the shingles that remain. Those surrounding pieces have to tolerate being lifted and refastened. If the garage still has an older three-tab roof while the house has a newer covering, the same size damaged area may lead to different repair recommendations.
There is no birthday at which every three-tab roof becomes unrepairable. Age helps establish context, but the condition of the shingles and their ability to accept the work matter more. Ask the contractor to explain whether a local repair can be completed without damaging adjacent material. If replacement is recommended, the explanation should identify the condition that makes a smaller repair impractical.
St. Louis freeze and thaw cycles add another reason to address an opening before water repeatedly reaches it. But seasonal weather is not evidence that the entire garage roof needs replacement. Separate the immediate problem, such as an exposed area, from the broader decision about worn shingles. You should be able to understand which work closes an opening and which work replaces a covering that has reached the end of its useful service.
What it costs: get a garage subtotal
Ask for the garage work to be priced separately even if one crew will handle both buildings. The estimate should state whether it covers a local repair or replacement, the measured area, removal of existing material and the proposed roof assembly. A single total for the property leaves you unable to judge the garage portion or remove it from the project without another round of pricing.
A small roof does not necessarily cost proportionately less than a large one. The crew still needs access, equipment and a way to remove debris. On a garage behind the house, materials may have to travel through a side gate or from an alley. Tell the contractor about locked gates, parked vehicles and any restrictions on using the neighboring property before the price is settled.
The wood beneath the shingles is another separate cost question. Exposed decking may allow some assessment from inside, but it does not make every condition visible. Ask what decking repairs are included, how additional replacement will be measured and what approval is required before extra work proceeds. A photograph of deteriorated wood should identify the garage location, rather than arriving as an unexplained addition to the house roofing bill.
If you are considering replacing both roofs together, ask for the actual price difference between doing them together and separately. Shared setup may affect the total, but the amount should come from the contractor's estimate. A possible convenience is not enough reason to replace a serviceable garage roof.
What to ask before including the garage
Use the garage portion of the proposal to answer these questions before authorizing work:
- What damage or deterioration did you find on this building?
- Can the affected area be repaired, and what condition limits that option?
- Which photographs show the garage rather than the house?
- What is the separate price, including removal and disposal?
- How will you price and obtain approval for concealed decking work?
- Where will materials and debris travel, and when must the garage be empty?
Also ask who will check permit requirements for the garage work at your address. Across St. Louis County, the applicable permit desk depends on the property's jurisdiction. The proposal should make responsibility clear rather than leaving you to assume that paperwork for the house automatically covers every part of the project.
Before the crew arrives, agree on where vehicles, tools and stored belongings will go. Removing roofing can drop dust and small debris through gaps in an unfinished roof deck. Ask what protection the crew provides inside the garage and what you need to move yourself. Make that decision while there is still time to clear the space.
To discuss storm damage with Keys Roofing, call (314) 220-2333. Say that the property includes a detached garage and describe its roof separately from the house. If you know that the two roofs were replaced at different times, include that detail when arranging the visit.