7 Proven Steps: How to Seal The Bottom of A Metal Building

Does the bottom of your metal building have a gap? It may cause water to seep into the building during rain. Plus, dust, debris, other particles, and pests may enter through the gaps between the lower metal base and the ground. 

So, how to seal the bottom of a metal building? Creating a barrier in the openings at the base is mandatory to maintain its structural integrity and prevent various issues. This write-up will guide you through closing the floor of your metal building step-by-step. 

How To Seal The Bottom Of A Metal Building Step-by-step? 

Do you want to successfully add a seal on the base of your metal building?

The process may be complicated if you have not done it before.

But it will be a simple job when you know the correct procedure and use suitable materials and equipment. 

The following is a step-by-step guideline to seal the bottom of a metal building. 

Step: 01— Gathering All Important Items    

The first essential task is gathering all the necessary things to seal metal building gaps.

The followings are the essential items to seal the metal building. 

Step: 02— Preparing The Work Surface   

Is your metal building a garage or any construction site? Dust and debris are likely to enter the building. 

Do you regularly clean the base? If not, it may have accumulated a lot of dust, dirt, and other particles.

It is necessary to clean the gaps or openings between the lower metal base and the ground before you use the sealant. Otherwise, it will compromise the effectiveness of the adhesive.

Also, it may trap moisture or chemicals during the curing period. So, use a wire brush to remove all dirt and contaminants from the surface and make it smooth and clean. 

Does the base of the metal building have oil and other insoluble substances? You can use a general degreaser to remove them.

Alternatively, a mild detergent or soapy water can be another option. Clean the surface thoroughly and let it dry properly before applying the sealant. 

Step: 03—Choosing The Right Sealant  

The next task is adding your preferred sealant into the sealant or caulking gun.

So, what is the best sealant for metal buildings? A lot of options are available when it comes to sealing the base of a metal building. 

But I recommend you use a silicone sealer or polyurethane caulk.

Silicone sealers are resistant to UV rays, weathering, and aging. You can use Gorilla Silicone Sealant, which effectively seals water, air, and moisture.

The product takes only 30 minutes to dry. Besides, you can use the sealant from outside and inside the area where the metal sits on the concrete.

Alternatively, polyurethane caulks are a great choice too. This heavy-duty adhesive is moisture- and corrosion-resistant and exceptionally hard.

You can use This Dap Polyurethane Sealant, which has a super adhesion power. It is easy to use and ensures at least 20-30 years of durability. 

Step: 04—Applying The Sealant 

Your sealant might be too good. But a quality seal will only be possible if you apply it correctly.

A caulking or sealant gun is handy for consistently placing a bead of caulk on the busway.

Cut the nozzle of your silicone or polyurethane sealant to 90 degrees. This will help you add the maximum amount of sealant to the openings without leaving any holes.

Hold the gun at a 90° angle and pull it towards yourself. Avoid moving too fast. Otherwise, the gaps won’t be filled evenly. 

After reaching the last section of the seam, free the handle and hold the lever to stop the sealant flow instantly.

Wondering how to seal metal building corners? The best approach is to complete the vertical section first, followed by the horizontal section.

But ensure it gives it enough time to cure before applying the horizontal section. 

Step: 05— Smoothing And Shaping The Sealer

After applying the sealant correctly, use a straight-edged, flexible putty knife to smooth the sealer. 

It will reduce the chance of air pockets, gaps, or uneven spots. The effectiveness of the sealant will increase. 

Besides, it will create a clean and visually appealing appearance by creating a neat and even finish.

Use your dominant hand to hold the handle of the putty knife. Apply gentle pressure on the putty knife and glide it smoothly along the length of the sealant.

Position the putty knife blade at a slight angle against the sealant. Start at one last section of the applied sealant and hold the tool at a 45-degree angle to the ground.

The blade should be in contact with the sealant, smoothing it evenly and removing any excess material.

Use a rag or paper towel to clean the excess sealant periodically. This will prevent the buildup of unwanted material on the blade. 

Step: 06— Letting The Sealant Cure

How long do sealants take to cure completely? It will vary from one another. 

Some may become fully dry within 30 to 60 minutes. Others may take 4 to 5 hours or even more to completely cure. 

Check the product description to learn how long you must wait after applying a sealant. 

Make sure to keep kids and pets away from the sealed area until it cures fully. 

Plus, you have to watch out for your work or other actions when you are close to this spot. 

Step: 07— Inspecting And Making Any Necessary Touch-Ups

Once the sealant has dried properly, inspect the condition of the adhesive.

 Sometimes, small imperfections or holes might only be visible once the sealant cures fully. 

If you notice any flaws, follow the same procedure to apply sealant on the particular area. 

Avoid over-sealing any spots, as it will create an uneven appearance. 

Frequently Asked Questions 

Wrapping UP

When sealing the base of a metal building, you have many options to choose from. But all are not reliable equally. Some may need to be compatible to use.

Don’t think your task is over after choosing the proper sealant. The more important job is correctly sealing the bottom of a metal building.

The right approach can save your investment and valuable time. Make sure to follow my step-by-step cautiously. Let me know if you need any further help!