Timber Strength Grading to BS5756,
for existing in-situ timbers & new timbers pre-installation.
We do this
In-depth evaluations assessing the strength of timber

Which does this
Establishes if existing timbers meet performance requirements

Giving you this
Classification status - the data needed to inform your project
In-situ visual strength grading of temperate hardwoods
(to BS5756)
The performance of a structural timber component is determined by its species, its dimensions, moisture content and its natural growth characteristics.
It is those growth characteristics such as knots, slope of grain, fissures, insect and fungal defects that are assessed by visual strength grading, and will determine the indicative strength classification assigned to each timber component.
Wondering if existing timbers meet performance requirements for change of use?
... let us take out the guess work & give you the data & confidence to move forwards
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Further reasons to work with Harper Building Diagnostics
As a leading building pathology & diagnostic consultancy we work with clients all over the UK and ... beyond
We are dedicated to producing positive outcomes for our clients
We're proud to have many clients who consider us part of their team
We regularly present at industry events and professional CPD seminars