7 Easy Steps to Sealing Your Basement Walls
Are the walls in your basement always a little damp after it
rains? Are you confronted with the smell of mildew and mold when
you walk down the basement stairs? Sealing your basement walls can
help with the moisture problems and offer a good start to your
How to Seal Your Basement Walls
Sealing your basement walls is not a difficult job, but it is
time consuming. If you have serious problems with moisture, such as
standing water in your basement, leave the sealing job to a
professional. If your problems are only occasional and minor, read
- Clear everything out of the basement and scrub the
walls. Read the instructions on the sealant you choose, and if a
special cleaner is required before application, use it exactly as
- Chip away loose paint, use special cleaners to
remove grease stains, and wash away salt deposits with a ten
percent solution of muriatic acid. The surface must be as smooth as
you can make it!
- Repair chips and cracks with a cement filler. It
helps if you can chisel the cracks into smooth openings,
undercutting them a bit so the outside of the hole is smaller than
the inside. This allows more support for the filler. Most fillers
need at least a week to dry.
- When the filler is dry, sand the area down until it
is level with the rest of the wall. Thoroughly vacuum up any dust
and debris when the job is done.
- Now it's time to apply the sealant! If you choose a
liquid sealant, your walls must be completely dry. Powder sealants,
on the other hand, require damp walls in order to work
- If there are areas around your cement filler or in
corners that are a bit rough, don't gloss over them! Use a stiff
brush to get the waterproofing sealant into even the toughest
areas. You are sure to be glad you performed this step during the
next heavy rain!
- Take your time in applying the sealant according to
the manufacturer's directions--don't miss even the tiniest spot.
Let the first coat dry thoroughly, and then apply a second coat.
Apply a third if necessary.
When your sealant is dry, it should be good for several years.
However, always be on the lookout for signs of moisture. If your
sealant doesn't do the trick and water continues to come into your
basement, it's time to call a professional contractor to help
you with the problem.
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