Six Important Considerations That Need To Be Taken Into Account In The Construction Of A Flat Roof

Blog

A flat roof needs to be well designed and properly constructed to function effectively. Flat roofs can be ideal for certain structures for a variety of reasons, but some basic errors in their construction could compromise their integrity and lead to damage to the structure below.

The following are six important considerations that need to be taken into account in the construction of a flat roof:

The exact applications of the flat roof

The end use of a flat roof determines what design and material selections will be best. For example, flat roofs are often chosen to accommodate solar panel installations. In this case, it's important to plan the design to support the weight of the panels in addition to the weight of the membrane itself and any planters that are installed. 

The membrane used under the roof to keep moisture out

Any flat roof needs to have a strong membrane installed to keep moisture out. Flat roofs are ideal in certain scenarios, but it's important to realize that they will not drain precipitation as quickly as a sloped roof. 

Some possible material choices for a flat roof membrane include reinforced bituminous membranes, EPDM, or GRP roofing systems. There are also some stronger and thicker spray-on membranes out there that may be appropriate for a flat roof. 

The design and makeup of the roof deck

The roof deck of a roof is the base over which the roof itself is constructed. Flat roofs need a particularly strong deck because a flat design will not shift structural support to the walls as effectively as a sloped roof design will.

The installation process for the flat roof

A high quality flat roof installation will focus on creating a tight fit around the membrane that will eliminate the possibility of leaks. 

The fall of the roof

A flat roof shouldn't be installed to be entirely flat. There should be an imperceptible slope that will allow for water drainage.

Any flat roof needs to have an adequate fall through the use of a slight slope in the joists. Otherwise, the height of supporting beam or purlins needs to be adjusted with the use of tapered supports to create a slight slope. 

The insulation installed beneath the roof surface

Ventilation needs to be taken into account if insulation is installed under the roof surface.

Insulation will be an obstacle to air flow and could increase moisture control issues caused by condensation, so ventilation vents are probably necessary on any flat roof with insulation installed underneath. 

For more information and options for flat roofs, talk with roofing contractors, such as those at Wespol Metal.

Share

6 September 2017

metal or shingled roofing - what do you choose?

I spent weeks researching metal and shingle roofing to try to figure out what would be the best material to use on my home. I weighed the costs, the length of life, the amount of maintenance required and how well each type would hold up to high winds and strong storms. After compiling all of the information that I needed to make an educated decision about the roofing for my home, I created a blog. This blog is meant to help other homeowners decide which roofing material would be best for their homes now and many years into the future.