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Estimating Gutter, Flashing, Ridge, Hipped and Valley Roll |
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Saturday, 12 April 2008 09:08 |
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In building construction, these items are categorized under the tinsmith work. Estimating these types of accessories is simply determining the number of Plain G.I. sheet needed to fabricate the gutter, flashing and the different rolls according to the shape.
The primary consideration in tinsmith work is economy which simply mean; “ To utilize every inch of the tin sheet”. As much as possible, any unwise cutting of the tin sheet should be avoided. Cutting should start from the widest to the narrowest part of the roof accessories. Experienced tinsmith do the start cutting from the gutter, then to the flashing down to the smallest plain G.I. strap to avoid waste.
Estimating Procedures:
- Determine the total length of the gutter in meter.
- Divide this length by 2.35 meter to find the number of gutter required.
- Find the total width of one gutter.
- Divide .90 meter (36 inches) width of one plain G.I. sheets by the result of step 3 to find out how many gutters could be made out from one plain G.I. sheet. The fractional value or extra cut will be reserved for other smaller parts.
- Divide the result of step 2 by the result of step 4. The result is the required number of G.I. sheets.
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