Basement Waterproofing How To
How most basement waterproofing issues are solved is by repelling water away from the basement with a watertight coating and a drainage system. The coating waterproofs the buried walls, while the drain collects and removes groundwater before it reaches the building. There are different methods on how to basement waterproofing, all of which require digging a trench around the bottom of the foundation.
How long waterproofing will protect buried walls is more or less based on the quality of work and materials used. It can deteriorate because of the compaction of the ground or structural cracks in the foundation.
The techniques used are suitable for both old and modern houses. The choice of the system and its level of performance are determined by:
- the nature of the soil and its moisture content;
- the type of masonry;
- of the house configuration.
A waterproof substance required on the walls and outer soles of the base down to the ground level.
Two great options when considering how to basement waterproof
Install an elastomeric synthetic rubber membrane (self-adhesive sheet or contact glue ) directly on the masonry wall;
put in a delta-MS or Soprema-type membrane (plastic set up in accordance with the manufacturer’s recommendations) which creates a protective coating against aggregates.
Make the most of the fact that your walls are excavated (procedure equal to a third of their waterproofing budget) to better protect them. You could:
Take note that a liquid rubber copolymer preparation, a tarred coating applied directly to the base, is not sufficient to effectively waterproof your foundation, even after a number of coatings. This material isn’t resistant to movement, so if the cracks or moves, infiltration is possible. Also, we can’t put such membranes inside, this measure must imperatively be performed on the face of the wall exposed to positive pressure (external ) and water exposures.
Why does a house need basement waterproofing?
Impermeable material over the entire exterior surface of the base must prevent water and moisture from entering the base walls or beneath the floor slab. Putting a membrane or liquid rubber preparation will reduce the possibility of moisture being generated, which can harm your materials and harm your health.
When a house is built, a pit wider than the foundation was dug. Initially, a sill plate is installed on the foundation along with sealant. This is the base on which the house rests and keeps it from sinking into the ground. The walls are constructed made of concrete, blocks, or even stones. A base drain is then installed around the perimeter and is used to allow water to drain from the dirt.
Eventually, fill dirt that’s been excavated from the hole is poured across the base. The ground is less compact than the virgin soil, as it’s been disturbed during excavation. It will stay less compacted throughout the life of the home and will absorb water faster than virgin ground.
This video shows the type of basement waterproofing that DIY enthusiasts could do on their own.
When you dig a hole in the ground and it rains, you would expect it to fill with water, right? It’s the same thing that happens when you put a house in the hole and it rains. The water seeps into the embankment around the foundation which is usually less compacted. Special measures need to be taken when waterproofing a basement in Minneapolis because the soil is always freezing and thawing.
Concrete poured foundation walls have water seepage often at the joint between the wall and the floor. Like concrete poured walls, block walls will also leak at the bottom joints. The foundation wall blocks filled with mortar joints that can weaken and crack and allow water flow to seep in. The block walls are hollow inside and once the water enters, it fills these hollow cores and leaks water through the wall. This water forms inside the concrete and fills up to where the water flows through the wall.
The space below your basement may also be backfilled and can also be full of water. This happens when water moves through the wall-floor joint and beneath the foundation footing and beneath your floor. Water can also adhere to a sewer line or underfloor water. If you have cracks in your basement, this water may push through the structural cracks in the foundation and create a pool of water in your basement.
How basement waterproofing is commonly done
Water can be intercepted at the back floor column using a perimeter waterproofing system and a sump pump. If there’s a particularly problematic crack on the basement, a side line could be run from the crack to the perimeter waterproofing system to keep it under control.
Storm sewers are notoriously inefficient because they’re usually not installed deep enough in the soil to drain down them to be inclined. Unless they’re installed in the base significantly deeper than the base, the water has to run into the storm sewer in order for it to work. Additionally, the quantity of water which the storm sewer can store is limited by its size.
However, this can only work in cases where the leak doesn’t need to run upward since the water naturally doesn’t leak in this way. Therefore, unless the dirt drops around your home over 9 or 10 feet, a downhill slope isn’t feasible.
If you’ve got a sump pump installed, then you can actively pump water out of your property. However, the sump pump can’t assist you if the footing drain which leads to it’s clogged and full of soil.
Foundation drains do work, but just for a little while and only if they’re installed so that they can drain effectively.
Another frequent repair method is to waterproof the foundation of the home from the exterior through an external excavation. To do this, the foundation needs to be dug up to the sill plate.
It is an enormous hole and a big job that requires skilled professionals. All the dirt excavated from the pit is deposited in the lawn. A waterproofing membrane is then implemented and drainage then returned into the hole. It is less compacted than previously. The water will flow through the drainage board to the base drain and if your slope isn’t steep or a storm sewer down the road to drain this water, a sump pump will be installed.
But then, the problem of clogged drain continues and in a couple of decades, this drain will also need to be replaced. The uncompacted embankment will strike through the years. You’ll have to add soil around the base and then you can update your landscaping and put things around the home. That is, you will understand, a somewhat disturbing and costly operation.
Water can enter the basement in different was based upon the wall type. This is one reason that a system design expert must arrive at the true location to ascertain the reason behind water leakage and provide you effective solutions to prevent future water leaks. Minneapolis Foundation Services have specialists that can help determine the best solution for your home. Contact us to schedule a free foundation inspection and receive a no-obligation free estimate.