Here is how a gable roof is erected

It was Emperor  Marcus Aurelius  Antoninus  who  said we should never  be  satisfied  with  superficial  knowledge. Absolutely.  So without wasting time, let us ride the wave of this counsel before it break on the heads of those who have chosen to ignore it. Roofing is much like a building foundation- it is both relatively expensive and easy to make costly mistakes. What you want to avoid is   a leaking roof or one that threaten to be blown away whenever the there is strong wind. Which is why you should never   save money by hiring second rate or unqualified roofers.

Erecting a gable roof should follow on the heels of a building walls completion. This sequence in important because while the load-bearing walls shoulder the weight of the roof, the roof on the other hand provide stability to the wall. In the absence a roof the top courses of wall will be weaker and may even pose a risk of collapse.

The process tees off by the Mason fixing the wall plates on the wall. Then  the   roofers  takes  the lead  role  by  first measuring  the  position of the wall  plates  and  transferring them to  the  rafters. The rafters are the main load-bearing timber beams in a roof    which are cut to fit the ridge and over the wall plates.

Second, the ceiling joist are craned in place and nailed on the wall plate. Joists are horizontal   beams that run t across from one wall to the other, on which both the ceiling board    and a pair of rafters are fixed.

Then two A  frames  are prepared,  with  space  for  ridge board  and  brace   nailed  to them  to make it easy  to  handle them. The  A  frames  are craned  into  a vertical  position  at  either end  of  the  roof  and  nailed   for good , into  the  wall plate and  ceiling  joist. To hold the A-frames upright   , makeshift braces are used.

Fourth   insert the  ridge board   on  the pair  of  A  frames and  nail  it in   again for  good. Once the  structure is stabilized  with  temporary  braces, install  a  series of a pair  of  common  rafters  by fixing them with nails  on wall plate and the  ridge board, along the  length  of  wall. Fix the purlins-which are timber beams  that  run across and  provide support to the rafters in their mid sections. For an overhanging verge, a gable ladder must be installed on the last common rafters.

Fifth , apply  the  cover  which  may be  clay  tiles or  corrugated  iron sheets. For iron sheet covers, the roofer must see to it that all overlaps and the exposed roofing nails are not sources of rainwater leaks. Once the cover is properly installed   the masons   is called in again to finish   gable end walls.

Finally a skilled carpenter is called in to finish the roof   at the verge and eaves    with fascia board and soffit.

©2017 Copyright: East Africa Little Hardware Ltd.

Sources: Carpentry &Joinery by Peter Brett.


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