Expansion Joint Caulking & Supplies

Find all kinds of expansion joint caulking and repair supplies at Pool Center at affordable prices. We carry NP-1 Sonneborn Sealant, E-Z Patch Joint Sealant, Vulkem 45 Caulking, Caulking Guns, and Backer Rod.

Pool Mastic Caulking

The expansion joint separates the pool and the deck and plays a very important role in ensuring that these two structures stay independent of each other. When temperatures change, your pool deck and pool expand and contract, and if they touch, the pool always loses to the deck, and eventually cracks right through the tile line.

It is necessary is to keep debris (sand, dirt, debris) out expansion joint, to make sure that the pool and the deck are not in contact with each other. If the joint fills up with grit, there is no room for expansion. Winter Ice in the joint is also a problem during winter, and can cause similar problems with ice expansion.

The best way to avoid all of these problems is by caulking the pool expansion joint; the gap between the pool deck and the pool coping.

Caulking the expansion joint is not as intimidating as it may sound and with the right supplies, you can easily perform the task yourself. You can replace your own pool caulking or concrete caulk in three easy steps.

1. Insert the backer rod to a depth of 1/4" into a clean, dry expansion joint. It is important that you remove all debris or sand first. The expansion joint should be "True", that is, extend between the deck and the coping stone, all the way to the earth.

2. If the joint is very uneven in width, you can slice the backer rod with a razor knife to fill in the gaps, or buy more than one size of backer rod. The rod must fit tightly, as shown in the diagram. Self-leveling caulk can be very runny, especially on a warm day, and you will lose a great deal of caulk that will run down into the joint. If you have a new pool, and there is a strip of rough, white foam, about 3/8" wide, already in the joint, this can either be cut down 1/2" with a razor knife, or burned down with a small gas torch, or just pushed down a bit into the joint, before adding your backer rod.

3. Begin with a dry joint, and make sure there is no rain forecast for the day. Insert your tubes into the caulking gun, snip the tip, and puncture the inner seal. Self-leveling caulk will come out very quickly. Keep a towel or sheet of cardboard moving with you around the pool deck. If your deck and coping are uneven, fill the joint up to just below the lower level. Runs onto the deck or stone can be wiped up quickly with a small towel. If the edges are very uneven, tape one or both sides of the joint with 2" wide masking tape before you begin to caulk your pool.