Structural Calculations for
timber beam repairs and strength upgrades
Historically, the majority
of repairs to structural timbers have been carried out using traditional
methods involving either the use of steel plates and bolts (Flitch Plates)
or a variety of timber scarf joints.
Although many of these traditional
repairs have been subject to engineering calculation and design, it
has to be assumed that the majority of repairs have been based on experience
and good judgment.
A major reason for this
assumption is that very few Contractors in the Building Conservation
Industry have their own in-house qualified Structural Engineers.
For the same reason most
structural repairs involving a resin component will not have been subject
to qualified engineering design.
The effects of legislation
and a greater awareness of contractual responsibilities are leading
to increased levels of engineering involvement in the building conservation
Regardless of the repair
method adopted there will often be a legal requirement to provide Structural
In the case of upgrading
a structure, (e.g. Increasing the floor loading from domestic to commercial
capacity), Structural Calculations will always be required, hence a
Structural Engineer will be involved from the outset.
Obtaining Structural Calculations
There are three ways in
which we provide Designs to contractors, clients or Engineers;
1. Our own free of charge
Design, produced from the beam information supplied by telephone, fax
or E Mail. This is an ideal starting point for a costing, to avoid expensive
Design confirmation before the feasibility has been assessed by comparing
the costs with other repair proposals.
2. Our internal Engineering
Check Calculation, using the Straight Line Theory of Elasticity, which
can be passed to the Client's Qualified Structural Engineer for indemnification.
3. Use of our external Independent
Qualified Structural Engineers, who will provide an Indemnified Calculation
and provide any adjustments to our Design for final costing.
from the Survey to enable us to prepare a free Design
for Repair - usually
from the outside or top, but may be considered from the inside or from
beneath (hardest physically for the Technician).
Note - check the two neighboring
properties for similar decay. Compression during rotting often causes
cracking to external render. Look for similar cracks around windows
- lintols may also be decayed.
Size - width, depth, length,
bearing support length
Number - one, two or three
- may vary in size
Timber type - softwood
(Pine) or hardwood (Oak), not known
Decay type - wet rot, insect
attack (CFB, DWB or Longhorn), Dry rot
Amount to cut off - drill
test holes if possible, or tap with a hammer
Final appearance required
- visible but painted, decorative natural finish, hidden
Handed - a sketch is useful,
Options for Timber Beam Calculations
worry about choosing a repair Type at this stage - we can discuss these
options with you when we have details of the damaged beams.
- solid resin or Timber Resin Splice (TRS)
access Types - top slot, side slot, bottom slot
TRS Types - Top Slot = Type
C, Side Slot = Type D, Bottom Slot = Inverted Type C
Special situation - multiple
Bressumers - if repaired entirely from the front or the rear face extra
timber has to be removed from the outer timber to give access to the
slot cutting face in the inner parent timber.
Costs for Structural
Calculations for Repairing Beams
Free of charge - our
Design and a Check Calculation - not Insurance Indemnified - we are
not Structural Engineers - same day service
Chargeable - independent
Structural Engineer - ask for one of our Forms - Indemnified by a Qualified
Structural Engineer - allow at least 5 working days likely to be £300
plus VAT per beam repair, with a reduction for multiple same sized beams.
Bressumer Structural Data
Collection Form - click
here for the Form used when we submit your Beam Repair to a Structural
Help for repairing Bressumer Beams
Repair Systems expert staff can help you with all kinds of timber repairs
and are more than happy to give further information and advice.
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Site written by: David
David Moore, B.A. (Hons.),
C.T.I.S., C.R.D.S. Technical Author
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