Roof waterproofing saves roofing materials and rafters from exposure to atmospheric water and reagents dissolved in it. To do this, a mass of mastics is produced using polymers, bituminous and their mixtures. Roof waterproofing materials have a wide range. The choice of mastic determines the durability and other protection properties.
There are traditional methods, there are advanced technologies, which are very different in cost and labor intensity.
Is waterproofing necessary?
Let's say you built a roof. The house is protected from atmospheric precipitation, everything is done correctly.If you have a so-called "cold" roof, then it will always be dry, and it makes no sense to spend time and money on warming it.
Another thing is if you are going to insulate the roof after a while, for example, to store something that is not frost-resistant, or for an attic room. How to waterproof a roof?
If you nevertheless decided on this and you need to insulate the roof, then waterproofing the roof with your own hands is not such a difficult matter.
Roof waterproofing, how to install it
In the past, roofing felt or other waterproofing materials were placed under the slate, which remarkably let water pass through with improper installation and nail holes. But let's not talk about the bad. Now on sale there are a lot of different films for waterproofing.
Basically, such films consist of a fibrous non-woven fabric made of propylene. They have wonderful properties. Advice. Lay such a film should be glossy up. Then the film will let air through and not let water through, and neither condensate nor rainwater will get inside the roof.
This condensate gets inside only if the conditions (temperature, pressure and humidity) for its occurrence occur in the roof: the so-called dew point. This cannot happen in a cold roof, because such a roof is perfectly ventilated and the temperature is almost equal to the outside one. Therefore, roof waterproofing is not required for the "cold" version.
In addition, the bottom non-gloss side has an anti-condensation layer of pile. This surface absorbs, like a sponge, a lot of moisture, "taking fire" on itself, relieving the warm roof of excess moisture.When the humidity subsides, the moisture dries safely and the insulation is not in danger.
Insulation can be mounted in an already finished roof. Therefore, it is first necessary to roof waterproofing.
However, working at height with a roll of film, to put it mildly, is not the most convenient experience. Here you put all the rafters. Unwind the roll along the rafters and gradually go through the entire roof with a stapler. Such an operation cannot be done alone, it is necessary at least together. One holds the roll, spins and tightens the film as necessary, the second works as a stapler.
After fixing the film, cut off the edge with a construction knife. Now you can attach the crate from the outside. Then, from the inside we fasten the counter-lattice. These will be slats of the same width as the rafters, and a thickness of at least 25 mm. Fasten with stainless steel screws.
The counter-lattice is attached along the rafters to the laid waterproofing film. It turns out a ventilation gap between the film and the roof.
Advice!
Choose a rail length slightly shorter than the film width.
The fact is that after attaching a row of film, again it is necessary to make a row of film, crate and counter-lattice, and so on, until the roof ends, higher and higher along the slope, to the ridge.
The overlap of the next layer of the film must be done up to 10 cm. We glue the joint with adhesive tape for additional insulation. If there are gaps where it is difficult to work with adhesive tape, smear with sealant.
When you get to the ridge, be sure to overlap the film over the top of the ridge. This edge should be additionally secured with a stapler so that it does not flap from the wind and is not torn.
Similarly, it is necessary to act on all slopes so that the film closes the internal space from all sides.
Naturally, since the laying of the waterproofing film and installation roof battens done at the same time, you will have to spend more time and effort.
Convenience comes at a cost, roof waterproofing and a warm roof are significant comforts.
What if the roof is concrete?
How to properly waterproof Roofif it is concrete?
Nowadays, for concrete roofs, solutions are used that greatly simplify waterproofing.
Waterproofing a concrete roof is carried out as follows.
- When repairing or building such a roof, first a screed is made with a slope in the right direction from a special concrete that practically does not let water through.
- Then various mastics are applied. There are bitumen-based mastics, or acrylic, or polyurethane. The main advantage is the application at normal temperature, there is no need to heat the mastic until it melts.
- Application is carried out with a paint sprayer, roller and even a regular brush. There are mastics with two reagents that must be mixed for hardening.
- After application, after a few days, the hardened film provides excellent waterproofing for 20 years.
Here is a list of the advantages of such waterproofing:
- elastic seamless coating with high mechanical strength,
- easy to cover the surface of any shape;
- easy repair;
- high tack to any building materials;
- long service life even if puddles have turned out;
- withstands UV radiation and heating in the heat;
- chemical and biological inertness, does not rot,
- withstand impact,
- after application and polymerization is not toxic,
- no shrinkage.
There is a possibility of a multi-colored covering.
Soundproofing
If you have a corrugated roof, then any rain that starts makes such a noise, as if shelling from a machine gun has begun.The same happens in the case of galvanized iron sheets. Roof insulation required.
There are various options.
- Put a layer of fiberglass 10 cm, better with plates, they have a higher density. At the same time, insulate your room. There is also specialized fiberglass for acoustics, but it is more expensive.
In principle, any fiberglass dampens sound well. However, an additional roof vapor barrier is required. - Buy a roll of cork. On sale there are thicknesses from 2 to 8 mm. In a roll - 10 sq.m. Similarly with fiberglass, additionally insulate the room.
- There is a penofol material, thickness 8 mm, you can fix it with a stapler directly on the counter-lattice. Sound, steam, and thermal insulation are immediately obtained. Penofol must be fixed with foil down, the roof is insulated by reflecting heat back into the room.
- One of the cheapest options is to cover the corrugated board with bitumen or polymer mastic in order to make it heavier and reduce the volume of the sound of rain.
There is also a liquid cork coating, but it is much more expensive, but the roof will take on an attractive appearance.
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