Tips on how to insulate the ceiling with foam

Tips on how to insulate the ceiling with foam

12 October 2017



Foam, despite the fact that it consists of 85-98 percent of the air is an excellent insulator. He does not miss the cold air, no noise. When this has a very low weight. Insulation of the ceiling of this material can be performed independently.


Can I insulate the ceiling foam alone

Standard foam layer fastening scheme is the following:

  1. Waterproofing foil.
  2. The reinforcing layer (ideal - basalt mesh).
  3. The foam (or attached using dowels, or a polyurethane layer).
  4. Stucco (applied from above to protect the foam from pests). It is necessary ground warp.
  5. Decorative finish (plasterboard, plastic panels, mounted or suspended ceiling, whitewashing, painting).

The only difficulty that will arise after the insulation foam ceiling - it increases the humidity indoors. The problem is solved quite simple - installing the forced ventilation or air conditioner that is capable of controlling moisture indoors.

If you do not - in the layer between the foam and waterproofing film begins to accumulate water condensation (as indoors in the winter - warm and the wall itself - cool). Naturally, this will result in mold, mildew. Over time, it will spread not only on the ceiling but also on the walls. It has been repeatedly violation of this technology has led to the fact that after the repair had to wallpaper glue completely after only 3-5 months, as they all were black.

Warming ceiling foam: strengths and weaknesses

Why should insulate the ceiling with foam is on the outside of the house? Because in this case, part of the ceiling will not freeze. Accordingly, the inside of the cold room to protect both insulating material (in this case - polystyrene) and roofing itself (if we are talking about the attic, i.e., residential attic). If heat insulation inside the outer cover at very low ambient temperatures will freeze, respectively, from the cold room only protect the same foam layer.

And why it is recommended to use foam?


Because it:

  • excellent soundproof and heat insulating quality (10-cm layer corresponds to about one-meter layer of red bricks);
  • low weight;
  • low cost;
  • easy installation.

The only drawback to the foam - it is its low resistance to moisture. If the material is moistened, it loses almost all of its insulating qualities, but with the passage of time and can be covered with mold.

 It is for this reason is not permitted by the banal bonding insulation foam on the same polyurethane adhesive.

Whether insulating protect layer of foam from cold if its secured within? Yes, and quite effectively. That's just before that he ceiling should carefully handle the pesticide ingredients that prevent the formation of mold, rot, fungus.



Warming of the foam from the inside of the ceiling with his hands

When it comes to insulation in a private home, the first thing you need to clarify whether the foam layer will help keep the heat inside the room. For example, it would be meaningless on the ground floor two-storey house, as the top and so - warm (if it installed heating). In fact, the foam in this case will only be protected from noise, but it is much easier to replace him on the same acoustic panels or just a padded mineral fiber thickness of only a few centimeters - that will be enough.

If there is no second floor, and on top - not heated attic, the foam layer is important. It is desirable to strengthen it with the outer part, but if this is not possible - this is done from the inside (for example, when it comes to high-rise apartment, which is located on the highest floor, and the top right is the roof).

The first step is to clean the ceiling of the finish to the capital level (concrete slabs, bricks, wooden beams). Further processing is performed pesticides. For this purpose a special solution, which is charged with a conventional sprayer and a high pressure is applied to the substrate. We should not forget the elementary rules of protection against chemical reagents, so as pesticides have an average grade of toxicity.

After the treatment, it is recommended to stop the repair for 2-3 days, while periodically airing room. This should be done even if the pesticide manufacturer claims that it is in no way toxic to the human body.

Even after all this, you can start with your hands to warm the ceiling. The first step is mounted waterproofing film. This may be either conventional polyethylene, and the combined multilayer moisture protection. Of course, the second embodiment will be preferred. Fasten such panels on the anchors, and generally better to use self-tapping screws, fleas, which do not have as such hats and screwed to the end of the level. They are not left protruding parts that will not harm the foam in the future.

On top of the waterproofing can be fastened himself foam. Allowable thickness thereof - in the range of 5 to 15 centimeters. More for the living quarters, and even insulation from the inside, it is not necessary. Fastens it also on the dowel or polyurethane glue. Experts recommend to perform a combination of these methods. That is, first to strengthen the glue, and already top all this strengthen dowels.

Further, the foam is pressed into the reinforcing mesh. This is best suited basalt fabric. Attach it can be over the entire surface by means of an ordinary construction stiplera. The main thing - not to spare staples.

Now is the whole area of ​​insulated ceiling applied primer.


Options for her a few:

  • dirt paint;
  • plaster layer (1-2 cm);
  • roughing plasterboard (fastening by adhesive);
  • special protective emulsion for the ceiling.

The preferred option - a dirt plaster. She holds the longest, and is inexpensive, and will last for decades. Plus to this - it acts as an additional reinforcement that provides mechanical protection of the ceiling.

From above it is possible to perform finishing using any material. You can use drywall suspended ceilings of PVC film (with a glossy finish), simple whitewash, foam plates and so on. It can be used even siding, cladding if it will look attractive in design terms.

Warming ceiling foam: reviews of those who have already performed

Studying the responses to the discussion forums can be said that the effect of the ceiling insulation foam in general - positive. Of course, it is recommended to insulate the walls and even the floor, but then necessarily have to mount additional ventilation system (coercive type, that is, to set the cooler and exchanger, which will also heat the incoming air inside).

The only caveat that not all been taken into account - namely the need to use foam front, which has a higher density (most often it is made of gray, and labeling is designated "F", but not all manufacturers comply with these rules).

The tests showed that the foam ceiling mounting:


  • increases the insulation space by 15 percent;
  • 3 times reduces the amount of noise;
  • visually aligns the surface, regardless of the bevels.

If the foam mount and on the walls, floor and window openings close modern PVC profiles with double-glazed windows with energy-saving, the insulation of the premises will be improved by 60-80 percent.

But that is still better - polystyrene or basalt fibers (sold in rolls and is also considered a good thermal insulation)? For technical specifications - wool, but the cost and effectiveness (considering money spent) favorite is without a doubt the foam. Besides, it is much easier to manage, edit. And if even one of the plates will need to replace - just do it. But a layer of glass will have to change completely. 

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