One of the most cost-effective insulated ceilings is to install IsoBoard as a roof-liner over trusses, beams and rafters.

The board, in addition to providing high levels of thermal insulation, provides a beautiful backdrop to exposed trusses, and can be painted to match as required.

Used as a ceiling in domestic homes (affordable and up-market) over exposed beams, trusses and rafters.

Note

IsoBoard can be retro fitted between rafters as per Nail Up Ceiling Guide 1.3

Suggested Bill of Quantity Specification:

Please contact IsoBoard directly for the latest insulation advice on installing over ralies or trusses. marketing@isoboard.com

Store boards flat within original packaging until required.

Boards are to be protected from adverse weather conditions and direct sunlight for the storage period.

Handle and install with care to prevent damage to board edges and exposed surfaces.

Wipe boards with cloth and softened water solution to clean as necessary.

Please contact IsoBoard for any queries with respect to the above.

Truss spacings not to exceed 750mm for minimal deflection.

Fix double-sided tape to truss to prevent boards from moving during the installation process.

Lay IsoBoard horizontally across trusses, ensuring that butt joins if necessary are effected over trusses. Lay additional boards and fit using tongue and groove edge profile.

Place purlins or battens over IsoBoard at required centres and secure with timberfix screws through IsoBoard into truss.

Fit a counter batten between purlins running along the truss or 3 screws with washers per board to secure IsoBoard to rafters and prevent uplift.

If required, a quarter round or similar edging can be secured to the truss beneath the IsoBoard to finish the installation.

A layer of 75mm Fibre Isulation can be laid over the IsoBoard to assist with the damping of weather noise where a steel roof is to be installed.

Lay roof sheeting or roof tiles as normal.

Paint visible face of IsoBoard with two coats of good quality Acrylic PVA.

In the case of small dwellings such as low cost housing designs, where 25mm IsoBoard is laid over rafters, fix a spacer strip of 20 mm over the board under the roof sheet to create an air gap, which assists in achieving the required thermal efficiency values.

Ordering IsoBoard for the over truss application

Stock lengths of 8m, 6m and 4.8m are available in 25mm, 30mm and 40mm thickness. Boards can be supplied cut-to-length by the Regional Distribution Centres. Request a quotation for your requirements.

Always order IsoBoard either edge bevelled or with the 100mm centre-grooved finish for this application.

Boards can be ordered to a specific length up to 8000mm where the order volume exceeds 50 cubic metres. Allow at least twenty working days lead time for supply of board.

Consult your nearest IsoBoard sales office for advice concerning the appropriate thickness of IsoBoard required for your installation.

Please click on the thumbnails below to see the detail on the schematics.

Figure 1	Figure 2

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