Single Ply Frequently Asked Questions

Providing answers to common technical enquiries on Bauder single ply systems. If you have any new question or require further information, please get in contact.

What is the difference between FPO (Thermoplan) & PVC (Thermofol)?

PVC and FPO membranes are both heat welded at the seams giving superior protection against leaks, as the two sheets are fused together forming a complete and durable roofing membrane system. FPO membranes usually need lap preparation to remove surface static which can otherwise interfere with the weld.

PVC (polyvinyl chloride) and FPO (Flexible polyolefin) share common characteristics, neither can claim an overall superiority over the other. However particular characteristics of each of these two polymers can be exploited by the specifier to enhance the specification of their single ply roofing system.

What is the product’s fire resistance?

The manufacturing formulation of PVC roof membranes gives them good inherent properties (i.e., chlorine) in relation to fire performance, although additives are required to ensure system passes for TS 1187 BROOF(t4).

FPO membranes also require additives to enhance their fire performance.

Bauder has completed numerous Single Ply system fire performance tests to BROOF (t4) at both zero and 45 degrees. A selection of these is detailed in the BBA certificates. For a full list contact the Bauder Single Ply Product Manager.

What is the RAL number of this Bauder Single Ply membrane?

Thermofol Light Grey 7035
■ Thermofol Blue Grey 7031
■ Thermofol Anthracite 7016
■ Thermofol Walkway 7012
■ Thermoplan Pearl White 1013
■ Thermoplan Silver Grey 7001
■ Thermoplan Walkway 7016

How do I protect the roof from following trades?

Following trades on a finished Bauder roof should always make provision for protection of the waterproofing. The most common protection being in the form of BauderGREEN FSM 600 Protection Mat, followed by a layer of plywood. This should provide adequate protection for the waterproofing whilst following trades carry out their remaining works.

Ensure plant or equipment that has been introduced to the roof are sited on suitable isolated slabs, with additional surface protection beneath. Ensure any fixings that may have been used to secure them, do not penetrate the waterproofing.

Once works are finished, clear all debris from the roof surface, rainwater outlets, chutes, gutters, etc. Debris must be removed from the roof and not simply flushed down rainwater pipes. Any waterproofing damage caused after completion of the original installation may invalidate the guarantee.

What should I know about Stainless Steel Vertical Outlets?

A high-performance stainless-steel outlet with factory installed PVC/FPO membrane flange, supplied with an O-ring and a wire ball leaf grate.

Available in various dimensions to meet project requirements:
■ DN70 (to suit 75mm-97mm rainwater pipe) – 2.98l/s flowrate
■ DN100 (to suit 110mm-128mm rainwater pipe) – 3.94l/s flowrate     
■ DN150 (to suit 160mm-178mm rainwater pipe) – 6.76l/s flowrate       
@35mm head of water with leafguard.

What should I know about ABL-R Rigid PVC & FPO Vertical Outlets?

A rigid PVC/FPO rainwater outlet enabling thermofol/thermoplan membrane to be welded to the flange plate, whilst UV stable throughout.

■ DN70 (to suit 75mm-97mm rainwater pipe) – 4.40l/s flowrate
■ DN100 (to suit 110mm-128mm rainwater pipe) – 6.00l/s flowrate     
■ DN150 (to suit 160mm-178mm rainwater pipe) – 7.50l/s flowrate      
@35mm head of water with leafguard

What should I know about balcony/parapet outlets?

BauderPVC DSP-R 110 Rigid PVC parapet outlet - 0.79 l/s flowrate, @35mm head of water.
The rigid PVC parapet outlet enables the membrane to be welded to the flange plate. It is UV stable throughout. The unbacked membrane should be heat welded up to the aperture to ensure colour consistency on the roof.
BauderTHERMOFOL PVC Letterbox parapet outlet DN190 – 1.85 l/s flowrate - @35mm head of water.
A high flow rate PVC parapet outlet for roof drainage systems. The factory bonded membrane flange attached to the outlet allows for easy installation. It is supplied with a stainless steel leafguard.

What is the maximum pitch that I can install BauderSOLAR on single ply roofs?

The maximum pitch of a single ply roof that BauderSOLAR can be installed on is 10 degrees.

What is the maximum pitch that I can install a Single ply roof?

The maximum pitch that a single ply roof should be installed is 70 degrees. The reason for this is that the fire test CEN/TS 1187: 2012 Test 4 External Fire exposure provide two options of incline. A flat test would cover a roof pitch between 0 and 10 degrees. The second sloping gradient test is at 45 degrees, and this covers a roof pitch between 10 and 70 degrees.