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Wall System 1 fixed direct to masonry substrate of either a single skin or cavity construction. The system can incorporate either mineral wool insulation, expanded polystyrene or phenolic insulation depending on the specifiers requirements.



Acrylic polymer based top coat supplied in various grain sizes offering a highly water repellent finish in a wide range of colours.

Silicone based top coat supplied in various grain sizes in a range of colours offering greater water repellency, vapour permeability and lower dirt retention.

High performance bagged product providing a quick drying grained, mineral alternative to EnviroCryl and EnviroSil.

Additional impact resistance

Additional impact resistance can be imparted to the system by incorporating an extra reinforcing layer with high impact meshes. For the highest level of impact resistance a 9mm RendaClad board or equivalent is fitted on top of the insulation prior to installation of renders.


A highly polymer modified OP cement for the adhesion of insulation boards. It offers extremely high levels of strength , adhesion and durability. It can be comb applied 3 to 5mm thick to the back of the insulation board or for uneven substrates can be applied in dabs up to 20mm thick.

Envirobed should only be used as an adhesive and never as a reinforcing base coat.


Highly polymer modified cementitious base coat applied 3-5mm thick incorporating a plastic coated reinforcing glass fibre mesh.


Typical System Build Up

  1. Insulation Board Typical 1200mm x 600mm No cut boards less than 200mm to be used. Type and thickness to be determined.
  2. Adhesively fixed insulation 3mm - 6mm grooved bed of Envirobed adhesive mortar or dot dabbed if recommended using appropriate guidelines for this form of application.
  3. SPSenvirowall high performance reinforcement mesh overlapped 100mm. Additional reinforcement patches over windows and doors.
  4. Basecoat 3-5mm of Envirobed highly polymer modified basecoat.
  5. Aluminium base bead 2.5 length. Use appropriate joining and base bead clip with mesh.
  6. Base bead fixing 6mm hammerfix, length and type to be determined by substrate, maximum 300mm centres. Minimum length 60mm, hole must be minimum 10mm longer than fixing.
  7. Insulation fixing Exact type and length to be determined by system and substrate. 60mm head, minimum embedment 35mm. For fixing pattern dependent on substrate and exposure rating see relevant detail sheet.
  8. Primer brush or roller applied primer the same colour shade as topcoat ensures more consistent finish
  9. Top Coat various topcoats available. Please see our range of topcoats on our products page

Applied to Framed Structures

External wall insulation systems are extensively used on lightweight framed structures. The speed at which they can be erected and weatherproofed provides large benefits to the developer. Removing the cladding from the critical path, bringing forward the internal trades and thereby shortening the contract period and eliminating the problems associated with brick and blockwork construction. This method of construction has proven extremely popular over recent years.

The details that follow demonstrate the use of the SPSenvirowall systems on lightweight steel frames although the principle operates equally effective on timber frame structures.

It should be noted that TRADA recommends the introduction of a partically ventilated cavity behind the cladding system in timber framed construction, therefore we recommend the RendaClad system for application to timber frame.

The SPSenvirowall external render systems provide a weather tight cladding and providing the openings are adequately detailed to provide a weather seal. It's our opinion that a cavity is not required for steel framed structures.

For technical information about Wall System 1 Applied to Masonry, select the download link below. You can also visit our Technical Resources page.