Unfortunately, it is not accepted intently for the work of the builders. Delicate hosts believe that such a sign of distrust will certainly insulted the masters, will force them to be nervous and will adversely affect the result of labor. This is the wrong approach. You can control the installation process and it is necessary, especially since it is not necessary to be an expert at all - it is only necessary to pay attention to several important details.
Does the Operation window matches? Errors occur at measure quite often: after dismantling old frames it turns out that the window barely fits in the opening or, on the contrary, falls out from a quarter. Ito and the other is extremely undesirable. For the next case, the installation seam around the window perimeter will be too narrow - it will be difficult to fill in the insulation, but most importantly, it will not be able to compensate for the thermal expansion of the PVC profile. If the gap between the window box and the wall is too large, it will inevitably have difficulty fastening the window, as well as hydro and vaporizolation of the mounting seam. The width of the latter is normalized by GOST 30971-2002 and depends on the dimensions of the design and color of profiles. For windows sizes up to 2000mm made of white profiles, its value should be 20-55mm.
PROFIN RUS. | 
PROFIN RUS. | 
PROFIN RUS. | 
PROFIN RUS. |
1. The window frame is installed in the opening.
2. The gap between the quarter and the frame is filled with sealant (it was used instead of psyl).
PROFIN RUS. | 
PROFIN RUS. | 
PROFIN RUS. | 
PROFIN RUS. |
3-7. Install the sash and adjust the accessories.
8. Installation is over.
Does the box right? The window is installed on the support pads and fixed in the opening using frame dowels or mounting plates. The step of attachment nodes for white plastic profiles should not exceed 700mm (from laminated - 600mm), and the distance from the inner corner of the box to the fastening element should be within 150-180mm (from an exemption to the mounting element - 120-180mm).
Is there any distortion? After the box fastened, it is necessary to make sure that it is exhibited by the level in two planes, and its diagonal is equal to each other. However, in our days, the defects of this type began to meet more and less.
How is the installation seam? The insulation (polyurethane foam) is required to be protected outside of precipitation and sunlight and from the inside - from a wet room air. In the opposite case, the foam will quickly collapse, and after 3-4 years from the seam along the perimeter of the window will begin blowing. Punching of external waterproofing can be used self-seeping ribbons, cement-polymer compositions and polyurethane sealants and mastic. Frozolize the insulation with the help of foil tapes or bitumen-polymer mastic. Note that the spokespring of the foam is better not to cut, and after 10-15 minutes, when the surface of the polyurethane foam is formed a crust, gently "publish" in the seam.
Rehau. | 
Rehau. | 
Rehau. | 
Rehau. |
9. Dark profiles expand stronger when heated, so the windows made of them are mounted differently than the usual white.
10. The window with three contours of the seal perfectly protects against drafts, but only if it was installed without distortion.
11. The higher the temperature of the internal glass, the less likely to form condensate on it.
12. The fold valve (in fact - the slot in the seal) provides an influx into a room of fresh air.
Does drainage functions? Drainage holes must be done in the lower profile of each window. They are necessary in order for water to penetrate during the rain through the seals, could freely flow out of the folded cavity (the gap between the box and sash). At the same time, in the upper jumper make another or two holes so that in this cavity there is no negative pressure that interferes with the flow of water. Check the work of the drainage is not difficult: pour to the lower fold box of a glass of water and immediately close the sash. After a few seconds, open it again - the water should not be left.
How does accessories work? Taking the operation of the installers, do not forget to check all the functions of the window provided by fittings. The handle should move without effort and fixed with a click in intermediate control positions. Make sure that the sash is not "backtit" and does not blow the window.
If you find the installation defect, do not sign an acceptance certificate. Contact the manager that made the order and demand to correct the shortcomings.