Where there are cracks in the garage on the roof

Where there are cracks in the garage on the roof – In garages, covered with thick concrete slabs , you can often detect cracks , especially on the exterior walls in places of transition ” masonry – concrete pavement .” Often this occurs in those cases where the concrete coating contains several garages and has no joints , does not provide a sliding bearing structure.

As shown further coating Rockwool insulation from the underside of the roofing may aggravate the situation . Cracks in the masonry often moistened penetrating rainwater that freezes in the winter with an increase in volume and lead to spalling and delamination of plastering . Reliable restoration activities can not be provided due to the constant continuation of the process of cracking.

Massive concrete coatings have significant thermal deformation , particularly in the absence of insulation. If the deformation is obstructed , it may cause significant stress , which inevitably leads to mechanical damage to building structures.

Of their daily practice Roofers familiar with injuries caused by, temperature deformation. To prevent deformation damage constructions used, for example device compensators deformations during installation of roof gutters. Another example is the installation of aluminum profiles on the roof overhang .

Aluminium profile 4 meter mounted at processing temperature of 5 ° C (eg in the spring ) . The coefficient of linear thermal expansion of aluminum is 0.024 mm / ( m * K) . Expected highest temperature in summer is 80 ° C. This means that the aluminum profile is extended by up to 7.2 mm ( in midsummer ) . When mounting the temperature of 30 ° C calculated elongation value of 4.8 mm. For these indicators calculated deformations during installation profiles must include seams that will lengthen materials without damage .

Joint width for aluminum profile length of 4 m at a temperature of 5 ° C mounting and several adjoining profiles is at least 7.2 mm . If one mounted aluminum profile, it is sufficient to leave a width of 3.6 mm stitches on each side. If more will follow more profiles , it is necessary to add 3.6 mm for each subsequent to reappeared minimum joint width of 7.2 mm.

If explore these seams on a frosty period at – 20 ° C, it can be seen that the width of the seams is 9.6 mm. This value is derived from the existing joint width of 7.2 mm at a temperature of installation for the year plus the calculated elongation of 2.4 mm, typical for winter compression (7.2 mm + 2.4 mm = 9.6 mm). These data allow us to understand how much compressed profile winter depending on the installation process temperature.

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