Home construction has gotten tighter and more energy efficient since the 1970s and sealers and sealants have played a roll in this. Most things in your home have seals, a polyurethane or epoxy, washer or grouting to help seal out air movement or moisture.

There's a quite popular misconception about sealants in basements. Many homeowners, after watching home improvement shows, or hearing a suggestion from a friend, think that by introducing a spray sealant, polyurethane or epoxy, to a concrete wall will keep water and moisture out.

In order for a concrete wall to become sealed, a chemical sealant would have to penetrate all the way through a concrete wall (typically 8-12" thick depending on what the home is constructed of). There aren't any concrete sealants on the market that can do that. Any DIY concrete sealant you buy would only act as a topcoat, making the surface of the concrete smooth and only slightly penetrating the concrete wall. It will not however make your basement waterproof.

For a chemical sealant that doesn't penetrate 100% the best application for it is on the outside of the foundation. That way the topcoat stops the water and moisture from coming into contact with the concrete, but even that is typically not enough. Many exterior basement-waterproofing companies also introduce polyethylene membranes on top of the sealant. With the amount of excavation that is necessary to do this type of work it's recommended that it be done during initial construction of the home's foundation, well before back filling.

Applying a concrete sealant on the interior of the basement will only help to protect you against water in it's vapor, or gas, form. This can help you to limit the amount of moisture, but it will not protect you against the threat of flooding.

A basement with a high moisture content and humidity problems is typically surrounded with more water than another basement. A concrete sealant won't stop a crack from forming and it won't stop water from working its way through the micro pores in the concrete (tinny gaps left behind from when the concrete cured).

Sealants of any kind are best used on surfaces that quickly absorb a chemical sealant, allow it to penetrate, and aren't constantly at odds against moisture and water such as a wood deck.The news come from http://www.bossgoo.com/