flat roof construction and waterproofing

on a roof with a standing wall, its best to have a capping beams or a coping with concrete which can help direct water flow.. a capping with a 50mm edge out side the wall.

for a concrete roof skirting must be done atlease 100mm high.. liquid bitumen is one the best water proofing matrial that is been used.

 

As below.. many layers of material is best specially for a wooden roof but if its a concrete slab its not that nessary for this must of roofing felt or bitunen layers since concrete it self is water proof.

Even if its a concrete or wood, even though its a flat rood it need atleast 3% slope .. if not as below there are high chances of water leaking.

 

Wood shingles on a roof

Wood shingles are used for roofs but for its a very risky method compare to modern roofing materials we use now... in fixing shingles there is a risk factor for example roofing felt may get a hole while worker screws to timber

After putting the ply Wood fix the roofing felt than screw the 1.5 inch wood batterns to it.. after that start singles with double over layer... 

Make sure the timber batterns are in a equal spacing and the legth of shingles shall cover the nail head to 50mm atleast.

Common types of roof truss - wood or steel truss

what we call a truss is a structural composed of slender members joined at there end points making a frame sort a thing, in construction industry its widely used either with wood struts, metal bars, angles or channels. these thing are joined with bolts, nail, or welding depending on the material used.

Truss used to support roof depends on the span, slop, and the roof materials. below are the common types used:

1. scissors
2. Howe
3. Pratt
4. Fan
5. Fink
6. Cambered fink
7. warren
8. Sawtooth
9. Bowstring
10. Three-Hinged arch

1. Scissors

2. Howe

3. Pratt

4. Fan

5. Fink

6. Cambered fink

7. warren

warren truss used in bridges

8. Sawtooth

sawtooth is very famous used in factory roofs

9. Bowstring

bowstring roof

10. Three-Hinged arch

below is a list of truss used in construction industry depending on design and use.