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  • James William McGiff

New Flat Roof (February 2020)



This is a flat roof we were contracted to repair just prior to the Covid-19 lockdown in February. Mr Ferns was a pleasure to work for and requested his roof be renewed in torch on felt.


The first stage of the process was to assess the damage and extent of disrepair. Leonard can be seen placing a ladder across the structure to spread his weight evenly across the old roof. At this point we did not know how fragile the roof was and therefore the best approach as always was the safest one.


Once we had evaluated the old roof we determined the best course of action was to remove , being careful not to cause unecessary damage to both the structure and ourselves.





Upon removing the tin and inspecting the supporting joists it is clear that the roof was very unsafe to walk on and that the current support is inadequate for supporting the new felt roof. It is clear from the photo that the joists are not fixed to anything and are balancing on the old timber against the wall.



The next step was to begin replacing all rotten joists where required. It was deemed that 3 of the old were not fit for purpose and so were removed completely. Thereinafter we temporarily removed all joists from the ceiling and fixed lengths of 8x2 timber to the wall to provide a strong base for the joists which it would be supporting as seen below.




As can be seen from the photo above, the joists were properly secured to the wall with brackets and spaced evenly to distribute the weight of the new felt roof evenly.




Having completed the joists, the next step in the process is to fit new 18mm marine plywood boards. We believe that 12mm would not be suitable for the load-bearing required and the 15mm is not as good as the thicker 18mm ( we prefer to use the best quality materials when possible to add to the lifespan of our projects ). This is technically the first layer of the new roof.


Layer 2 of the new felt roof is the base layer of felt underlay which is to be manually fixed to the roof with tacks or small nails. It is important not to use any adhesive as the purpose of this layer is to allow for movement in times of extreme weather- both cold and warm. Otherwise, the felt would fracture. The underlay can be seen in the background of the image above.




Layer number 3 (but no.2 only of the felting process) is also an underlay material. The difference being an adhesive exists to bond it to the first layer of felt shown above. It is important to avoid any overlapping of joints between the 2 layers and to make sure all the seals/creases are bonded properly. Being careful not to burn anything, Leonard can be seen applying the 2nd layer of underlay above, distributing the heat evenly across the roll.




The final layer and top layer is applied using the same techniques as before. This is industry standard mineral felt being used. Triangular fillets were used where required to bond the new felt roof to the wall and provide a water-tight seal to the area below.




A final check was performed on the new roof, making sure there was no gaps or seams which could allow water to seep into the garage.


"The best roofing company in Glasgow"


Mr ferns was very happy with the work Re-roof Scotland carried out on his new roof, commenting that the firm's work was flawless and the price was competitive. We look forward to future projects with him.



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