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Fibre Cement Sheet, The Perfect Shelter


Economical Sizing & Estimating For Visaka Crrugated Sheets & Accessories


SIZING

a) For Roof
1) Let us assume the slope length is L metre.

2) To cover this length, minimum number of sheets required N
Where N=L-0.200/2.8 (a whole number).

3) Maximum lap loss is M metre
Where M= (N-1) x 0.200.

4) Maximum sheet length required is P
Where P = L + M => L + (N-1) x 0.200 (rounded off to next digit divisible by 0.25).

5) Once P is obtained, sizing should be done keeping the number of sheets at N.

6) check if the slope can be covered by (P - 0.25).

7) Check that the number of purlins does not exceed - K
Where k= L - ( a1 + a2) / 1.40 + 1 (a whole number)
Where a1 = distance between the eaves purling and the eaves edge in - Metre.
Where A2 = distance between the eaves purling and the eaves edge in - Metre.

b) For Wall Cladding
Most economical length is 1.75 M. which allows a Rail spacing of 1.6 M..

ESTIMATING

For both Roof & Wall Cladding. Number of sheets in a particular row
N = L - 0.04 / 1.01 (a whole number)
Where L = Length of the shed in Metre..







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