External Wall Insulation Finishing Systems

ProRend External Insulation Finishing System, EIFS for short, is a complete insulated render system for new build and renovation properties both residential and commercial.

ProRend EIFS rail system overview

The ProRend EIFS rail system offers high thermal efficiency and a durable, long lasting finish. Combining expanded polystyrene and mineral fibre insulation with a grid style rail construction, ProRend EIFS rail system can provide a breathable ventilated cavity ideally suited to timber and steel frame construction. ProRend EIFS insulated render system also offers the perfect solution for uneven and troublesome substrates that cannot receive renders directly.

The ProRend EIFS rail system comes with a 10 year product guarantee against material failure.

Features and benefits

  • Thermal efficiency – achieve u-values down to 0.15 W/m2K or less
  • Suitable for new build and renovation projects
  • Building regulation part B compliant
  • Building regulation part L compliant
  • Water tight façade
  • Ventilated cavity
  • Breathable render system
  • Low maintenance

System overview

  • Cavity created by packing shims
  • Grid system created by ProBead rail tracks and t splines
  • EPS/Mineral fibre insulation
  • ProRend Lite Basecoat
  • ProMesh Grade 3 mesh
  • ProRend Lite Basecoat
  • ProRend Colourtex Primer
  • ProRend Colourtex Uniform/Grained

Adhesive Starter Track

insulated render system
Rail Starter Track

  1. DPC Membrane
  2. ProRend EIFS ventilated starter track
  3. Fixings at 600mm centres into sheathing board

Termination Profile and
Packing Shims

  1. PVCu termination profile sits on ventilated starter track
  2. Packing shims create typical 15mm cavity
  3. PVCu termination profile fixed through sheathing board into steel uprights
  4. Use of laser beam to confirm level application of rails

Insulation Application

Insulation Application

  1. Insulation panels fitted with rebated grooves embedded on PVCu termination profile
  2. PVCu intermediate track fitted into rebated groove of insulation panel
  3. Vertical PVCu T spline between every insulation panel clips into PVCu termination profile below
  4. PVCu intermediate track packed off substrate in line with laser aligned cavity
  5. Mechanical fixing into every vertical upright
Insulation Application Continued

  1. Repeat with additional intermediate tracks
  2. Insulation panels installed block bond with minimum 150mm stagger

Aperture Planning

Insulation Layout Around Apertures
  1. Minimum 150mm stagger of insulant joints
  2. Avoid vertical or horizontal joints at corners of apertures
  3. Cut insulation panels to fit around aperture corners

Corner Detail

insulated render system
Insulation Corner Detail

  1. Ensure alternating block bond at corner

Reveal Detail

  1. Insulation panels fitted around aperture to avoid horizontal and vertical joints at corners
  2. Face insulation panels fitted 20mm back from window frame
  3. 20mm insulation fillet fitted to end of insulation panels closing rail cavity
  4. Joins in insulation fillet not coincident with joins in face insulation panels
  5. Adhesive bitumen sealtape fitted between insulation fillet and window frame to ensure watertight seal

Rail Reveal

Ventilation Services And Flue Pipe

Ventilation Service

  1. Ventilation services fitted through edge of insulation panel with vertical join at centre
  2. Ventilation service must avoid intermediate rail tracks
  3. PVCu T splines to be cut to appropriate length by installer
Hot Flue

  1. Hot flue requires mineral fibre insulation (if primary insulant is EPS) around hot flue pipe
  2. Hot flue fitted through edge of insulation panel with vertical join at centre
  3. For systems using EPS as primary insulant minimum distance of EPS from hot flue to be determined during system design
  4. Hot flue must avoid intermediate rail tracks
  5. PVCu T splines to be cut to appropriate length by installer

Fire Barriers In EPS Rail Systems

EPS Rail Fire Barrier 1

  1. Mechanically fix stainless steel fire track to substrate above final row of EPS insulation
  2. Stainless steel fire track contains ventilation and drainage holes in cavity section
  3. Mechanically fix intumescent strip to substrate above stainless steel fire track
EPS Rail Fire Barrier

  1. Install course of Mineral Wool Rail Slab
  2. Further mechanically fix with stainless steel fire track above insulation
  3. Use vertical PVCu T spline to fix insulation between stainless steel fire tracks
EPS Rail Fire Barrier Continued

  1. Continue installation of EPS rail system above fire barrier using PVCu intermediate tracks

Mesh-coat Layout

Mesh Overlap Layout

  1. Minimum 100mm overlap between layers of mesh
  2. 300x300mm reinforcement squares at corners of apertures at 45&dec;
  3. Applied within 4-7mm ProRend Lite basecoat

Render Application

Following application of the insulation components of ProRend EIFS the decorative render system is applied:

  1. ProBead Noseless Meshed Angle beads to corners
  2. ProBead Window Protection Beads to window and door returns
  3. 4-7mm ProRend Lite mesh-coat with embedded ProMesh Grade 3 – see figure 24 above
  4. ProRend Colourtex Primer
  5. ProRend Colourtex Finish

Refer to ProRend brochure for application, technical details and CE markings of ProRend render products.


A wide range of tools and fixings are available which are used during the application of the ProRend EIFS system. Further details will be stated as part of the written documentation for the project.

ProRend EIFS Rasp
ProRend Finishing Spatula
ProRend Colourtex PVC Float

Sample U-value Calculation

Rail system new build over lightweight steel constructed walls using 130mm Mineral Wool Slab
ConstructionThickness, mLambda, W/mKR, m2K/W
External Resistivity0.04
ProRend Colourtex0.00150.7000.00
ProRend Lite0.00500.2700.02
ProRend EIFS Mineral Wool Slab0.13000.0363.61
BS EN ISO 6946 Cavity0.01500.0880.17
BS EN 12524 Sheathing Board0.00900.1300.07
Metal Frame0.10000.5560.18
BS EN 12524 Gypsum Plastering0.00300.5700.01
Internal Resistivity0.13
0.2885R = 4.35m2K/W
U = 0.23W/m2K

† U value calculations according to BS EN ISO 6946

SWIGA - Solid Wall Insulation Guarantee

SWIGA Guarantees are a 25 year insurance backed guarantees offering cover against defects in materials, workmanship and design.

The SWIGA guarantee is available as a separate guarantee to SAS (Europe) Ltd.’s own 10 year product guarantee and is supplied by SWIGA.


  • The work must be completed be a SWIGA contractor member
  • The contractor carrying out the work must be PAS2030 certified
  • The installed system must belong to a SWIGA system certificate holder member
  • The installed system must be BBA certified
  • The property must be 4 stories or less
  • A fee of £79 plus VAT must be paid to SWIGA by the property owner

Installers Obligations

  • Installers must be registered with SWIGA
  • Installers must be trained by the system manufacturer
  • Installers must be PAS2030 certified
  • A minimum of one PAS2030 certified installer must be on site for every four uncertified installers at all times
  • Installers must submit a pre-notification form to SWIGA at least 5 working days before the installation start date
  • Work cannot commence until the installers have received authorisation from SWIGA
  • Installers must submit the application for the guarantee once the work is completed and the installation has been signed off by the system manufacturer

SAS (Europe) Ltd's Obligations

  • SAS must train the installers to PAS2030
  • SAS must issue installers with ID cards
  • SAS must endorse the installers application to become SWIGA registered
  • SAS must carry out a minimum of two ‘work-in-progress’ site inspections per year for each installer
  • SAS must advise SWIGA of the names of trained individuals