2015 ibc code commentary.
Minimum parapet height flat roof uk.
If the criteria indicated below cannot be attained design calculations should be submitted to indicate suitability.
If penetrating the outside of the wall is not an option a freestanding non penetrating railing can be used to keep people back to from the roof edge.
If you can penetrate your roof parapet there are several roof parapet railing solutions.
Bs 6229 2003 flat roofs with continuously supported coverings code of practice and bs 8217 2005 reinforced bitumen membranes for roofing code of practice both state that if unwanted water ingress into the building is to be avoided all weatherproofing upstands occurring around the roof area.
The design of drainage falls should ensure that the continuity of the waterproof covering is maintained for a vertical height of 150mm above the finished roof level at all abutments door openings and parapets.
Datum is defined as any level surface used as a reference in measuring elevations.
The minimum height of a parapet wall above the roof surface is 30 inches.
If penetrating the outside wall or parapet wall is not an option a freestanding non penetrating guardrail can be used to keep people back from the roof edge.
Find out more about modular handrail for parapets.
The uk building regulations part k requires a guardrail to consist of a minimum two horizontal rails with a minimum height of 1100mm.
The minimum thickness and maximum height of parapet walls should be as indicated in the diagram below.
Which would include abutments rooflights.
The height requirement for an external fixed balustrade railing per current building regulations is a minimum of 1100 mm from datum.
British standard bs 6229 2003 flat roofs with continuously supported coverings section 7 page 12 requires that.
Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate.
In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface.
Type a cavity wall.
However when a roof slopes down toward an exterior wall and parapet with a slope greater than 2 12 further analysis is required to determine if a taller parapet is necessary.
Install a non penetrating full height railing.
We offer railings that attach to the top of the parapet.
