Interior and Exterior Caulking Services in Fort Collins, CO & Surrounding Areas

Serving Berthoud, Johnstown, Fort Collins, Loveland, Windsor, or surrounding Northern Colorado areas


Established in 1998 - Fully Licensed and Insured - Detail-Oriented


A well‑sealed joint is the first line of defense between your home and Colorado’s unpredictable weather. Caulking means filling the small gaps and seams around windows, doors, siding, and interior fixtures with a flexible sealant. When it is done right, it shuts out water, pests, and drafts, and it helps your heating and cooling dollars stay where they belong, inside your home.

Why Professional Caulking Matters

  • Helps prevent water from sneaking in and causing headaches like wood rot or hidden damage down the road

  • Cut down on drafts around windows and doors so your heating and cooling dollars stay inside where they belong

  • Seal the little cracks pests use to get in, keeping ants, spiders, and other unwelcome guests outside

  • Give trim, siding, and tile a clean, finished look that adds polish to your home’s curb appeal

Our Proven Caulking Process

We use a step‑by‑step approach that makes sure every joint is sealed correctly and built to hold up over time.

Walkthrough and Assessment

We start with a walkthrough of your property and call out likely trouble areas, including windows, doors, siding seams, and fixtures. When needed, we use tools to check for hidden moisture before sealing begins.

Careful Prep

We remove failed caulk, clean the joint, and confirm it is dry so the new sealant bonds. For wider gaps, we use joint fillers or backer rod so the sealant cures in the proper shape.

Application

We apply the caulk in clean, consistent beads, then tool each bead so it bonds well and looks sharp. We also select a sealant type and color that blends with your home.

Quality Check

Once the sealant sets, we inspect our work to confirm every seam is sealed tight, neat, and ready to stand up to the weather.

Final Walkthrough

We end with a quick walkthrough, showing what was sealed, how long it should cure, and simple care tips. We stand behind the work with warranty protection.

Colorado-Specific Seasonal Considerations & Maintenance TipsFort Collins Climate and Code Considerations

Working in Northern Colorado means we size and specify every seal to handle local conditions and regulations.


High Altitude Challenges

At more than 5,000 feet, the sun is stronger and temperatures can swing fast. We use UV‑stable sealants that flex with the weather instead of cracking.


Freeze‑Thaw Cycles

With winter temperatures bouncing above and below freezing, joints move. We use elastic sealants that keep their grip and do not split when the weather turns.


Snowmelt and Summer Storms

Between spring melt and sudden summer downpours, water is tough on homes here. We use low‑shrink sealants and shape joints to push water away from your siding and foundation.


Permit and Inspection Support

If your project needs a permit, we handle the paperwork and complete the work to code so you are covered when inspectors stop by.

Our Interior and Exterior Caulking Services

We seal joints inside and out so your home gets protection where it matters most.


Interior Caulking


  • Bathrooms, including tubs, showers, sinks, and tile transitions

  • Kitchens, including countertops, backsplashes, and vent penetrations

  • Windows and doors, including trim, jambs, and drywall gaps

  • Specialty areas such as attic hatches, utility penetrations, and built‑ins

Exterior Caulking



  • Siding seams on vinyl, fiber cement, and stucco

  • Window and door perimeters on wood, vinyl, and aluminum frames

  • Foundations and concrete, including slab edges and crack repair

  • Decks and patios, including ledger boards, rail posts, and expansion joints

  • Driveways and walkways, including control joints and curb interfaces


Seal Your Home with Confidence

Do not let leaky joints cost you comfort, energy, or peace of mind. At J Allen, our Fort Collins‑based team is licensed, insured, and ready to deliver top‑quality interior and exterior caulking tailored to Northern Colorado’s climate.

Take the Next Step

Ready to update your home? Call us for an estimate and let’s talk about your goals.


Contact us:

  • Call us today at (970) 568-7351 for an on-site assessment.
  • Or send us a quick note through our online form, and we’ll be in touch soon.


We stand behind our work with the kind of quality you can count on for the long haul.

What Folks Around Here Are Saying

Marvin J

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We used J Allen for a complete kitchen and master bath remodel and was extremely pleased with the finished products. Jerry and his team provided innovative suggestions in the design and the attention to detail and workmanship was outstanding. We are now using J Allen to build our new home!

Richard S

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Great people working for you!!!

tj v

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I was working in Germany when we contracted J. Allen Construction to build our retirement home in Colorado. We selected J. Allen Construction due to their exceptional reputation for quality construction, professional integrity and commitment to maintain schedule. We knew that even though we weren't present to inspect construction, that Jerry Allen would build the house as if it was his own. Over the last 20 years J. Allen Construction has contacted us every year to inspect the house for necessary repairs or upgrades and used his quality construction crew and subs to perform any needed work. We highly recommend J. Allen Construction. Quality, Integrity, and Service are the fundamentals of this company.