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Important factors for installation of aluminium profile mats: tolerance and heat expansion


The standard expansion tolerance of the Geggus entrance matting systems is 2.0 to 2.5 mm on all four sides; i.e. 4mm to 5mm must be deducted from the internal frame dimension to the finished mat dimension in both directions – walking direction and profile length.

Heat Expansion

Aluminium profiles may expand when exposed to heat and so with large-sized mats, the standard tolerance may be too small. If exposed to intense solar radiation, the mat might then buckle in the frame or even warp if sufficient tolerance is not provided.

So, when installing large mats, we recommend allowing additional tolerance in the profile length, as detailed in the following table:

When installing large mats, please provide additional tolerance in the profile length according to the following table:

Profile length

(Overall thickness, also valid for multi-part mats)

Tolerance in the profile length

(Tolerance in walking direction remains 4 – 5 mm)

up to 6 m

4 mm – 5 mm

6 m – 10 m

6 mm – 7 mm

over 10 m

 8 mm – 10 mm


geggus pdf catalogue download Installation of aluminium profile entrance mats – Tolerance / heat expansion – PDF File

If you submit frame dimensions only when ordering a matting system (frame and mat), we will calculate the sufficient expansion tolerance according to the above table for you. The width of the frame will be added.

Example: Matting system, external frame dimension 8m profile length

External frame dimension

8.000 mm

minus frame width

– 6 mm

minus tolerance 6 – 7 mm

– 7 mm

mat profile length

 7.987 mm


Get a quote for your entrance matting.

Call us on:

01761 419427

Geggus Matting Systems is supplied exclusively in the UK by MMA Architectural Systems. We are also the sole UK agent for Jakob Rope Systems, providing quality solutions for Green Walls, Car Park Safety, Animal Enclosures and Bridge Safety.