Infrequent maintenance access on to an exposed Sika-Trocal membrane surface roof, such as for the regular biannual inspection of rainwater outlets, checking security of flashings etc, can be carried out without any special precautions. It should be noted however, that when wet, Sika-Trocal can be slippery underfoot and that appropriate footwear should be worn.


In situations when there is plant that will need frequent inspections and/or maintenance on the roof i.e. regular foot traffic, then precautionary measures are required to contain the potential effects of that traffic on the thermal insulation and waterproofing.


To provide that protection Sika-Trocal provide two options of purpose made walkway materials. On most ballasted roofs, walkways would normally be created with rows of pavers, as gravel ballast is unsuitable for foot traffic. Note that even with the provision of walkways, exposed membrane roofs are not intended or suitable either as fire escape routes or for public/leisure use.

Sika-Trocal WPB20

A standard walkway can be provided by simply welding 2.0mm thick pyramid embossed Sika-Trocal WPB20 on top of the Sika-Trocal waterproofing a layer.


Where higher resistance to foot traffic is required a mechanically fastened galvanised steel sheet can be installed under the SIka-Trocal roof waterproofing membrane. The walkway need to be planned and installed in advance of the primary waterproofing. A protection layer such as S-Felt Type A must be installed between the steel sheet and the Sika-Trocal membrane.


Note: the steel plate used as reinforcement to the walkway is not vapour permeable, its use should therefore be restricted to no more than 20% of the total roof area.

Sika-Trocal WPB40

A heavier duty walkway can be provided by simply welding 4.0mm thick pyramid embossed Sika-Trocal WPB40 on top of the Sika-Trocal waterproofing a layer.


Where higher resistance to foot traffic is required a mechanically fastened galvanised steel sheet can be installed under the Sika-Trocal roof waterproofing membrane. The walkway need to be planned and installed in advance of the primary waterproofing. A protection layer such as S-Felt Type A must be installed between the steel sheet and the Sika-Trocal membrane.


Note: the steel plate used as reinforcement to the walkway is not vapour permeable, its use should therefore be restricted to no more than 20% of the total roof area.