Laying on the mounting aerated foam

The construction of the cottage of aerated concrete is considered one of the most common technologies dispensation in the country. Regular readers FORUMHOUSE well aware that the aerated concrete blocks should be put on a special adhesive.

Adhesive aerated provides tonkoshovnost masonry (with a seam thickness of 1-2 mm), which reduces the "thermal bridges" and reduces heat loss from the building.

When laying blocks on a cement-sand mortar joint thickness is increased up to 10-12 mm. Calculated in the wall area, such seams are transformed into powerful "cold bridges". Since the thermal conductivity of the cement-sand mortar is higher than the thermal conductivity of aerated concrete, this leads to significant heat losses.

When using the adhesive through the masonry joints is lost up to 10% of the thermal energy, and the use of cement-sand mortar losses amount to 30%.

This leads to the need for additional heat insulation house and increase the power of the heating system. Also aerated concrete masonry adhesive is economically more advantageous than the block masonry cement-sand mortar.

grout bag is cheaper than similar volume glue bag. But ultimately, in the recalculation of 1 m3 masonry, due to a thin seam, glue consumption will be much less than that of the cement slurry.

In recent years, Europe is gaining popularity masonry piece materials - aerated concrete and warm ceramics - a special, one-component polyurethane adhesive - mounting foam.

A similar method:

• Improves the thermal insulation properties of masonry, as eliminates the cold bridges.
• Accelerate the construction of the house, because it reduces the number of "wet" processes.

Does the right to life of this technology? Let us turn to the members of the forum experience.

Especially aerated concrete masonry at mounting foam

Like everything new, this technology raises many questions. Try to understand the main points.

jek48 (Member FORUMHOUSE):

I want to build a house. At first thought to build karkasnik, but my neighbor - a builder with experience - suggests to build the house of the gas or foam. Moreover clutch not lead cement slurry, and the foam core (special polyurethane glue). So I think whether to do so?

Opinions divided members of the forum. Someone with both hands "for" technology. Someone thinks that the house, "assembled" on the adhesive foam, or fall apart immediately, or will stay long. The main question is the durability of a laying. If the cement properties are predictable and well understood in the long term, what will happen to the mounting foam, for example, in 10-15 years? Especially in our climate - with frequent passages through the "0" severe frosts, rain, etc.

The main enemy of the materials based on polymers (these include adhesive foam) - is ultraviolet radiation. For example, when installing windows unclosed foam when exposed to sunlight, it is destroyed for 1 year. However, the foam in the masonry is completely isolated from the harmful effects of ultraviolet radiation. If you leave the facade works for later, the most that can happen with the foam in the masonry - will burn the outside seam layer 1-1.5 mm wide. This does not affect the strength of the structure. But in order to ensure when laying blocks on the foam did not need to use the first available polyurethane glue, purchased the building market, and special designed for such work.

Nadegniy (Member FORUMHOUSE):

Foam need a special, low secondary expansion ratio, with a homogeneous structure, a waterproof type. Others simply fall apart.

Practice the use of foam with a low secondary expansion coefficient showed that after its rejection of masonry seam not deforms stored geometrical stability stacked block in both the horizontal and vertical plane.

To achieve this, in addition to a special foam, it is necessary to adhere to the block stacking technology. To do this, the following conditions must be met:

• The geometry of the blocks must be perfect.
• Particular attention should be given to the first row of blocks. Evenness of this series sets the whole geometry of the future wall. The first row of blocks is laid conventionally on a cement-sand mortar.

• All irregularities blocks it is necessary to grind down a plane, and the surface is sanded blocks torkami.
• Prior to extrusion foam block must be cleaned of debris and dust.
• The surface unit moisten brush dipped in water.
• Foam on the block (depending on its width) is applied in one, two or three strips, the entire length of the block.
• The distance between the strips of foam - about 10 cm.
• To excess foam is not squeezed in the slit, the strip is applied without reaching 5 cm to the edge block.

When these precautions foam, under the weight of the block, it spreads a thin layer on its surface, filling all the fine irregularities.

It provides:

• increased adhesion;
• increases the contact patch between the blocks;
• prevents further shrinkage of the wall;
• minimizes point loads, because completely blocks lie on each other.

When the main clutch tonkoshovnoy problem solution - to hold the shear block. In fact, the house can be folded out of the blocks and "dry". Such construction will stand (not in the seismic region) only by frictional forces arising between the blocks.

Jkorch (Member FORUMHOUSE):

I have long worked in the installation of the windows, and I know that even heavy foam materials can be glued. It depends on the area of ​​the mating surfaces. And the foam of aerated concrete - it is not scum, but the real glue! I tried to put on gas silicate adhesive foam. I note that it is very convenient to work, but the units must be minimal deviations in size. Because my blocks were far from ideal, it has gone to a compromise - foam filling only vertical joints and the horizontal - an ordinary adhesive.

Practice of the foam using

Currently, the use of foam instead of cement mortar is recommended only for non-bearing masonry (e.g., interior partitions), and self-bearing walls in the monolithic skeleton construction. The use of foam for laying load-bearing walls while in our country is not officially confirmed. While in the Czech Republic and Poland, masonry bearing walls on the foam is carried out since 2007. Members Forumhouse, as usual, are the pioneers of new construction technologies. Consider their experience.

Serge 67pena (Member FORUMHOUSE):

I have built a house of foam blocks, "on the foam." The house is situated 5 years. Using foam build a second home. In my opinion, it is much more convenient than fiddling with the kneading of the solution, by adding water, further cleaning tools from the grout. foam easy to clean up. Masonry itself looks clean and tidy.

If you get the hand, then 1 foam cylinder will last for 1.5-2 cubic meters of aerated concrete masonry. And, after a few minutes have passed after the unit laying it off already with great difficulty and only under the stress of a large mallet. After 15-20 minutes, tear flow, without damaging it, is impossible.

Validating with the nickname for the sake of the experiment Gansales glued foam three blocks at the ends (to bridge). Without reinforcement blocks to keep your weight enshrined only for the most ends (about 5 cm on each side). A similar test adhesive does not resist.

Gansales (Member FORUMHOUSE):

I build a house in their spare time. On the site there is no water. If you previously had to stir the solution to carry water into the canister, but now everything is simple - to get fastening tool, set the balloon, quickly squeezed the foam blocks are put in a couple of hours in the evening and food home.

When laying on the foam block is added a lot of manual work on the polishing block, but also when laying aerated adhesive it is also necessary to grind. According to observations forumchanin when compared value masonry "adhesive / foam", the foam obtained is more expensive about 2 times (much depends on the experience of the mason and width of blocks used). But, at the cost of laying recalculation "to foam" of one row, the final price is increased by about 5%, which is the value of the house has almost no effect.

So far, the technology of packing material piece on the foam did not pass the test of time sufficient - Gameday bearing walls lay at your own risk. But the method has the advantages of:

• laying can be carried out on a portion where no water and electricity required for the preparation of solutions based on cement;
• cleaned "thermal bridges";
• laying speed and increased time is saved;
• it is not necessary each time at the end of the working day to wash instruments;
• laying process on the foam more technologically and practically wasteless.

Learn all about the laying of gas and foam to foam can be in this topic. How to reduce the cost and improve the construction quality of the house of aerated concrete, tells here. Detailed description of all stages of the construction of the house of aerated concrete is available this link. BUT in this video It explains all the nuances of self-construction of aerated concrete building.

Discuss the article and read other materials devoted to country life you can on the websiteFORUMHOUSE.

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