The STA Guide to Timber Frame Panels

Completed timber frame homes with dark weatherboard cladding above a brick plinth

Timber Frames

Timber frame construction, being one of the Modern Methods of Construction (MMC) in today’s buoyant industry, can be manufactured as an off site product in various panel make ups. What Merronbrook is absolutely committed to is making sure we conform to a pattern book tested panel by the STA.

STA Gold Assure Member
Pattern Book Tested Panels
Open Panel System
Four Performance Levels

Merronbrook’s Timber Frame Panel

As an STA Gold Assure member, Merronbrook is making sure our panel offering is an STA pattern book tested panel.

We offer an open panel system, using a 140mm CLS stud insulated with a rigid insulation board. This is then clad externally with 9mm OSB ply, finished with a reflective shield breather paper.

STA Assure Gold
Cutaway drawing of a timber frame home, from the foundations and floor through the wall panels to the roof

Our Standard Panel

As a compliant panel make up, the following elements need to be installed:

  • External façade: brick or block
  • 50mm cavity
  • Reflective shield breather paper
  • 9mm OSB ply
  • Or an A1 non combustible board for fire mitigation properties
  • 140mm CLS timber stud
  • 120mm PIR rigid insulation board
Drawing of the Standard panel build up: timber studs, rigid insulation board and reflective breather paper

Performance Upgrades

To take our Standard panel to any desired performance level, we can advise on the following additional products to be installed internally.

Drawing of the Enhanced panel build up with a reflective VCL and service void batten

Enhanced

  • Reflective VCL (Vapour Control Layer)
  • 25mm x 38mm service void batten
Drawing of the Super panel build up with a reflective VCL, PIR insulation overboard and service void batten

Super

  • Reflective VCL (Vapour Control Layer)
  • 25mm PIR rigid insulation overboard
  • 25mm x 38mm service void batten
Drawing of the Superior panel build up with a reflective VCL, thicker PIR insulation overboard and service void batten

Superior

  • Reflective VCL (Vapour Control Layer)
  • 50mm PIR rigid insulation overboard
  • 25mm x 38mm service void batten

Please note: All U-values need to be calculated by a qualified SAP assessor. Merronbrook are not responsible for any values given as a guide during the estimating procedure.

Timber Frame Panel FAQs

Answers to some of the questions we are asked most about our timber frame panels.

Our Timber Frame LeafletDownload the PDF

MMC means Modern Methods of Construction, so anything that is deemed to be an off site manufactured product.

The timber grade for timber frame stud panels is CLS.

Adding additional insulation to the internal face can achieve much better U-values. Other materials such as insulated vapour barriers and insulated plasterboard can all increase performance levels.

Engineered wood products such as trussed rafters, floor joists and timber frame panels are all manufactured in a quality controlled, purpose built facility operating to the highest STA and ISO Quality Assurance standards.

Our facility is open for an organised tour. Please contact us to arrange a suitable date and time.

Why Merronbrook?

As always, Merronbrook is striving to achieve the best results for our clients, guiding them through ever changing legislation within this demanding industry.

Timber frame house, half clad to show the frame