Why We Wait 30 Days After Repointing to Apply Drylok

When repairing foundations or basement walls, repointing (the process of removing and replacing deteriorated mortar joints) is one of the most effective ways to restore structural integrity and prevent water from finding its way inside. While this step often solves the problem on its own, some homeowners ask about additional protection, such as applying Drylok waterproofing paint.

It’s important to understand two things:

1. Drylok is optional. It’s not part of every project because repointing itself addresses the core issue—cracked, crumbling, or open mortar joints that allow water intrusion.

2. Timing matters. If you do choose to add Drylok as an extra measure, it should only be applied after the mortar has had time to properly cure.

Why Wait 30 Days?

Fresh mortar needs time to dry, set, and cure. During this curing process, moisture is still evaporating from the mortar and the new joints are gaining strength. If Drylok (or any sealant/paint) is applied too soon:

• The curing process can be disrupted.

• Moisture may become trapped inside the wall, leading to efflorescence (white, powdery deposits).

• The waterproof coating may not adhere properly, reducing its effectiveness.

Allowing a 30-day cure period ensures the mortar is stable and fully set, providing the best surface for Drylok to bond to.

Do You Need Drylok After Repointing?

Not always. Many repointing projects resolve water seepage without the need for an additional coating. However, Drylok can be beneficial if:

• You want extra peace of mind in areas prone to moisture.

• Your basement will be finished or used as living space.

• You’re looking for added protection against dampness and minor water intrusion.

Think of Drylok as an extra layer of insurance—helpful in some situations, but not necessary in every case.

Our Approach

At New England Foundation Crack Repair, we always start by addressing the root cause with proper repointing. If you’re interested in going one step further, we’ll explain the benefits and timing of applying Drylok, but we’ll never recommend it as a blanket solution. Each home is unique, and we tailor our approach to your needs.

Key Takeaway: Repointing fixes the structural problem. Drylok after repointing is an optional add-on that can provide extra protection, but only once the mortar has fully cured—about 30 days after the repair.