# 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..