Continue the calculation of components for the asphalt cherepitsy.3. Metal accessories.
First, let's define some of the concepts.
The metal cornice is installed on all eaves of the roof, front bar - on the ends. Metal junction installed in places of contiguity of the roof to the walls, as well as the presence on the roof brick chimneys used strap seal.
In the calculation should take into account the fact that the standard straps have a length of 2 lm, and mounted lap which is equal to 2 cm
In our example (Figure 1 Calculation of cellular shingles Part 1) configuration of the roof involves the use of only metal cornice.
Metal cornice eaves = length * 1.02 / 2 = (5.3 * 2 8.7 * 2) * 1.02 / 2 = 14.28 pc
Accordingly, it is required to us 15 pieces of metal cornices.
The remaining bars are calculated in a similar way (the location of strips on the roof see Figure 2)
4. Konkovo / curtain tiles.
The tiles are rectangular in shape and are universal. When you use the tiles on the ledge, it is completely used, and the ridge - the third part. Thus a packing can cover 12 lm Skate or 20 lm cornice.
K / K = length of the ridge tiles / 12 the length of the eaves / 20
In our case, K / K = 21.3 / 12 28 / 20 = 3.175 packages, ie 4 packs.
5. Valley carpet.
Valley carpet is designed to seal the most vulnerable areas of the roof: a roof internal kinks (valley) and the contiguity of places to pipes and vertical walls. The roll has a color similar to the color of an ordinary roof tiles and a length of 10 lm, width 1m.p.
Valley carpet = (length of valley length of adjacency to the pipes and walls) / 10
In our case, the need for this type of material is not.
6. Roofing nails.
Shingles used nails with a size 30 * 10 * 2,5 mm.
When ramp slope of 45 degrees each shingle roof tiles fastened 4 pieces of nails, but with a larger slope of - 6. K / shingles nailed 4 pieces of nails. Underlayment and valley carpet has a step attachment 25 cm
There is a universal formula for the calculation of nails = actual area * 0.08
In our case, consumption of nails = 71.478 * 0.08 = 5.72 ie 6 kg of nails.
7. Bituminous mastic.
Bitumen is used for additional sealing end parts and junctions for pipes and walls, as well as the edges of the valley carpet.
Based on the consumption rates of bitumen mastic is calculated as
length end parts * 0.1 * 0.4 length of valley length of adjacency to the wall * 0,75
In our example, the mastic is required.
8. Ventilation system.
Prerequisite is the ventilation elements. On each slope (in our example of 4 pieces) to put at least one vent element. In the calculation of ventilation should be borne in mind that for every 60 sq.m. roof requires a vent element.
On this account ends. Good luck.
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