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For homeowners

Types of caulk: which one fits the joint you are sealing?

Choose Silicone caulk for kitchen and bath, countertop and sanitary seals (on one maker's data sheet); Acrylic latex caulk for gaps and cracks that will be painted (on one maker's data sheet); Polyurethane sealant for weatherproofing joints in concrete or masonry, wood and metal (on one maker's data sheet); Butyl rubber caulk for seams, joints and gaps on metal gutters, flashing and roof penetrations (on one maker's data sheet); High-temperature (heat-resistant) caulk for sealing around flues and chimneys (ENERGY STAR, 2008).

The right choice depends on whether the joint will be painted, whether it stays wet, which materials the joint joins, and how hot the surface gets.

How we know: By InstaBids editorial team with AI research agents. · Sources read: 22 October 2026 · Updated 27 October 2026

South Carolina Energy Office (Energy Saver page): caulk is a flexible material used to seal air leaks through cracks, gaps, or joints between stationary building components and materials.
TypeBest forMain advantagesMain drawbacks
Silicone caulkkitchen and bath, countertop and sanitary seals (on one maker's data sheet)Louisiana DENR caulking lesson (undated): remains flexible after curing; Louisiana DENR caulking lesson (undated): exhibits little or no shrinkageDAP silicone data sheet (2019): not paintable, so paint the surface before applying the sealant; DAP silicone data sheet (2019): not recommended for continuous under water use, chimneys, stovepipes or fireplace applications
Acrylic latex caulkgaps and cracks that will be painted (on one maker's data sheet)Louisiana DENR caulking lesson (undated): may be sanded and painted, and cleans up with water; DAP acrylic latex plus silicone data sheet (2025): paintable in 30 minutes with latex or oil-based paintsDAP acrylic latex plus silicone data sheet (2025): do not apply when rain or freezing temperatures are forecast within 24 hours; DAP acrylic latex plus silicone data sheet (2025): not for continuous underwater use or expansion joints
Polyurethane sealantweatherproofing joints in concrete or masonry, wood and metal (on one maker's data sheet)Sikaflex polyurethane data sheet (2026): paintable with water, oil and rubber-based paints; Sikaflex polyurethane data sheet (2026): an elastic sealant between materials with dissimilar coefficients of expansionSikaflex polyurethane data sheet (2026): allow 7 days of cure before painting over it or submerging it in water; Sikaflex polyurethane data sheet (2026): not for swimming pools or other submerged spots exposed to strong oxidizers
Butyl rubber caulkseams, joints and gaps on metal gutters, flashing and roof penetrations (on one maker's data sheet)DAP butyl rubber data sheet (2019): adheres to wet or damp surfaces; Louisiana DENR caulking lesson (undated): seals dissimilar materials (glass, metal, wood, concrete) and may be paintedLouisiana DENR caulking lesson (undated): some shrinkage will occur, and it must be applied above 40 degrees F; DAP butyl rubber data sheet (2019): paint ready time is 7 days
High-temperature (heat-resistant) caulksealing around flues and chimneys (ENERGY STAR, 2008)ENERGY STAR sealing guide (2008): the sealant it names for the gap between a flue and its metal flashing, where spray foam is not to be used; DOE Energy Saver Guide (2022): furnace cement caulk is one of the fire-resistant materials it names for sealing around fireplace chimneys, furnaces and gas-fired water heater ventsno official source names one

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

Post your job on InstaBids, and contractors can bid in writing on one written scope.

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InstaBids assistantAI · builds your written scope with you

What caulking and sealing gaps around the house job do you need done in your home? Describe it once to start your written scope.

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  1. Describe it onceBy chat, or through your own AI assistant, and add photos.
  2. Post it and send itContractors bid in writing on that scope.
  3. Compare line by lineEvery quote is written against the same scope.
  4. You chooseContact details stay hidden until you pick and they confirm.
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Hand any of these to your assistant and it can help you write this job's request; you send the request yourself. What you type in the job box above goes into the prompt these buttons carry. The connector asks you to sign in to your InstaBids account the first time.

  • MCP connector URLhttps://instabids.ai/api/agent/mcp
  • Agent API (OpenAPI)https://instabids.ai/openapi.json
  • Start-request linkhttps://instabids.ai/intake?from=options-caulk&utm_source=us&utm_medium=page&utm_campaign=options&page_type=options#job=caulking%20and%20sealing%20gaps%20around%20the%20house
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Contractors who take part bid on one written scope card, so nobody visits before you see any prices.

The contractor you pick may visit once before settling the final price against the percentage the bid stated.

Contractors in your trade see the scope card and your 5-digit ZIP code.

Contact details stay hidden until the homeowner picks a contractor and they confirm the connection.

Homeowners pay InstaBids nothing.

Sources for the facts on this page

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