Roofing material profiled sheeting allows you to build a roof in one of the cheapest ways. First, the roof of the corrugated board is mounted quite quickly. Secondly, for its installation, no additional building materials, other than standard heaters and all kinds of barriers, are required.
These factors determine the relatively low cost of installation work. But the most noteworthy in the device of the roof of the profiled sheeting is that it is quite possible to cover it yourself. And the first thing that needs to be done on this path is to learn how to properly calculate the necessary material.
How to calculate roofing material from corrugated board
Calculation of corrugated board for roof
The basic factor determining the amount of necessary material is the roof area - it is based on its size that the calculation of the roof from the corrugated board is carried out.
Start the calculation of building materials need from wood - as a rule, profiled sheets are laid on a special crate, made of unedged boards with a thickness of at least 20 mm. It is installed across the skates with an interval of 200-300mm. Knowing the step setting of the bars and the length of the roof slope, you can easily calculate the amount of wood needed in running meters.
We go further and calculate the required amount of insulation, steam and hydraulic barrier - everything is simple here. The number of these materials fully correspond to the roof area, plus a small margin for overlaps and editions. As a rule, in a percentage ratio this stock does not exceed 3-4% of the calculated figure. No need to save on this - an unhealthy craving for savings will only lead to the fact that the construction of the roof from the corrugated board will not be able to cope with the duties assigned to it qualitatively. And it will serve much less.
With the margin it is necessary to calculate the profiled sheet itself - it fits with an overlap of 100-150 mm. Just rounding the necessary material in the big direction will be wrong - in percentage terms this stock is characterized by figures of 4-5% of the total roof area. Its something and it is necessary to add to the clean area of the roof.
Fasteners( self-tapping screws with press washers) can also be counted with a small error, as a rule, 30 to 50 screws are required for fixing one profiled sheet.
Installation of the roof from the profiled flooring
So, we will start the installation of the roof from the profiled flooring from the crate-let's assume that the load-bearing structure itself has already been assembled. Rafters are mounted almost the same for all roofing materials, so we will not be distracted by them.
Assembling the roof from the corrugated board photo
At the first stage of work, a hydro-barrier is laid over the roof structure - it is a reinforced cellophane film intended to drain water accidentally leaked under the roofing material. The flooring of the hydro-barrier must be started from the lower edge of the roof - it is rolled out to the full length of the roof and fastened to the rafters with a wooden beam. If the width of the hydrobarrier is not enough to cover the entire roof in one fell swoop, then the next canvas overlaps the previous one, and the spacing should not be less than 200-300mm.
When the hydrobarrier is laid, the next thing that provides the technology of roofing from the corrugated board is the device of the crate. Crossing the rafters with a step of 200-300 mm fixed unedged board - it will serve as the basis for fixing the corrugated board. With the same success it can either be nailed to the rafters with nails, or screwed with long self-tapping screws on wood.
Pay special attention to the roof ridge - there boards of the roofing of individual roof slopes should not be close to each other. This clearance guarantees good ventilation of the under-roof space.
It is also necessary to ensure a small outreach of the boards to the roof from the roof - this is a kind of protection of the walls against the flow of water flowing down during the rain. Departure should be about 200-250mm.
Well, the last stage of outdoor work, which involves the construction of roofs from corrugated board, is the direct attachment of profiled sheets. This process also needs to start from the bottom of the roof - each edge of the overlying sheet of corrugated sheet must overlap the edge of the bottom. Only in this way, by ensuring an overlap between sheets within 100-150 mm, it can be ensured that the roofing is completely sealed from the profiled sheet.
The sheets of corrugated sheets next to each other must also be laid with overlapping of the previous one - here the size of the inlet is determined by the pitch of the wave of this material.
Mounting of the roof from the corrugated board photo
Fastening of the profiled metal sheets is carried out by screws with press washers directly into the upper part of the wave - they are installed in rows with a step no more than 400mm. The sheets of corrugated sheets adjoining each other are fixed by one common row of screws.
This is how the roof is made of corrugated board with their own hands. But this is not the end of the entire roof installation - in addition, it must be insulated from the inside.
How to insulate the roof from the corrugated board
Roof insulation from the corrugated board
This will require a heater such as mineral wool and basalt slabs and parobarrier.
So, get down from the roof to the attic and get to work. Mineral insulation, no matter roll or sheet, fit into the gap between the rafters. For its fastening, you can use almost anything - you can glue it, screw it with a wide washer and even lock it tight with a tight thread. As you secure it, this is personally your business, the main thing is that this fastening fulfills its function and does not compress the sealant. Remember that it is not the cotton wool itself that blocks the penetration of the cold, but the air inside it.
Further on top of the cotton wool, the vapor barrier is stretched - the principle is the same as when laying the hydrobarrier. What is it for? The fact is that moisture contained in the air can reduce the thermal insulation characteristics of mineral wool - the more it absorbs moisture, the less it can retain heat. To prevent moisture from getting inside the insulation, steam and hydraulic barriers are used.
Special attention should be given to the creation of the so-called cold triangle at the top of the roof - do not insulate the space located at a distance of 300-400mm from the roof ridge. This cold triangle will improve the air circulation in the attic, and at the same time will ensure a good ventilation of the inside of the roof.
That's basically all you need to know about how to make a roof of corrugated board. There is nothing complicated here, the main thing is to strictly observe the entire installation technology. And the sizes of a roof and volumes of forthcoming works to be frightened it is not necessary.
If you are afraid that a house left homeless can suffer from the rain, then the work can be done gradually - they opened a part of the roof and immediately made it, then another part. Roof from profiled sheeting makes it easy to carry out this sequence of work.
The author of the article Vladimir Belov
