moulded timbers without damaging their decorative surface, probe through floor boards or panelling into the underlying structure, or through very soft lime plaster into concealed lintels. Where timbers are buried behind denser materials (perhaps under floor screeds or behind a single skin of brick) the Sibert can be used with an 8mm pilot hole and a sleeved extension probe. ACITVE OR ANCIENT Dead fungus does not disappear and old beetle flight holes remain permanently visible after the beetles have left the wood. Unfortunately, it is not uncommon for old inactive damage to be rediscovered and often destructive exposure and expensive treatments are repeated to combat evidence of historic fungal decay or insect infestation. In order to avoid extensive futile works, it is essential to establish the level of current activity and continuing decay potential. Alltimber decay organisms have a requirement for elevated moisture levels. Moisture meters are therefore fundamental to every survey kit and if used with intelligence they can be a useful tool. However, their limitations should be recognised and unconditional faith in their diagnosis of dampness is misplaced. It is commonly, though erroneously, upheld that decay is inevitable above 20% timber moisture content and moisture meters often highlight a scale of risk with warning lights illuminating at this legendary 20%threshold. In practice wood -boring beetle infestations may tolerate less and fungi generally require significantly more water. The most widely used meters are based on the electrical resistance of timber. However our recent research has demonstrated that the electrical resistance properties of timber change with age. In consequence it ispossible to have modem replacement and historic original timber adjacent· SIBERT TECHNOLOGY manufacturers & suppliers of DECAY DETECTION & ASSESSMENT EQUIPMENT Investigating problems in wood? We supply the most suitable equipment for the task, including SONIC HAMMERS, MICRO DRILLS and the unique DECAY DETECTING DRILL This micro-drilling instrument remains the most popular and effective method of gathering very accurate information. • Light, portable and simple to use. • Life long rechargeable battery. • Accurate graphic records show extent of decay. • No structural damage to timber. • Used in industry and conservation. • Excellent tuition and after-sales service. Sibert Technology - Ja Merrow BusinessCentre Merrow Lane - Guildford - GU4 7WA TEL: 01483 301266 FAX: 01483 302699 CONTEXT49 s~ eteem~ The most gentle way to clean limestone, sandstone, terracotta brick, faience, etc The Patented chemical free environmentally friendly swirling, vortex. No other cleaning system can match the over-all performance of JOS. Clean without damage. Control the level of cleaning. Retain the patina and mellow character of an old building without making it look new. Ask for a list of notable buildings already cleaned with JOS and use only Stonehealth Approved Contractors STONEHEALTH LIMITED 73 London Road • Marlborough • Wilts • SN8 2AN Tel & Fax: 01672 511515 Not all face lifts involve plastic surgery. If you want your sash windows to look as good as new but don't want to use modern, often characterless replacements, call Ventrolla. Not only can our skilled craftsmen restore your windows' appearance, but they can also improve your windows' performance. Our Perimeter Sealing System is a Design Council Award winner that both eliminates draughts and reduces outside noise without altering your windows' original appearance or charm. For details of how Ventrolla can help your refurbishment plans, please return the coupon below or FREEPHONE 0800 378278. \kntroHla® THEALTERNATIVE TOWINDOWREPLACEMENT ------->{- Post to Ventrolla, FREEPOST, HG68, Harrogate, North YorkshireHG2 7BR. Name ______ _ Company _____ _ Address ______ _ Postcode _____ _ Tel/Fax______ c=M,~96 15
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