The House Longhorn beetle measures up to 25 mm long when mature, and can lay up to 200 eggs on the rough surface of untreated timber. After 2-3 weeks, the larvae emerge and bore into the timber. They can be detected by the powdery deposits known as ‘frass’ left on the surface and the bore holes of around 3 mm diameter. They are attreacted to damp areas and timber with a high moisture content.
Other woodborer insects include:
- Furniture beetle: These are 6-8 mm long and lay 20-50 eggs on soft or hardwoods.
- Lyctus powder post beetle: These are 10-15 mm long and lap 70-200 eggs on the sapwood of new hardwood.
- Death Watch beetle: Around 7 mm long and lay 40-80 eggs on hardwood. Are a particular problem on oak timbers found in old churches and similar buildings.
Timber can be treated:by:
- A water-based boron treatment which can be sprayed or brushed on, or injected as a gel or paste.
- Ultraviolet insect killers.
- Fumigation or fogging.
- Replacing affected wood.
- Monitoring and improving conditions to prevent re-infestation.
A specialist survey may be necessary to determine the most appropriate form of treatment.
 Related articles on Designing Buildings Wiki
- Ancient Woodland.
- Building preservation archive.
- Confederation of Timber Industries.
- Cross-laminated timber.
- Defects in construction.
- Domestic roofs.
- Dry rot fungus.
- European Union Timber Regulation.
- Flat roof defects.
- Flooring defects.
- Laminated veneer lumber LVL.
- Recognising wood rot and insect damage in buildings.
- Roofing defects.
- Timber framed buildings and fire.
- Timber preservation.
- Woodworm and spiders.
Featured articles and news
The branch explores ‘Heritage in Law’ in its 2017 Conference, supported by Historic England which takes place in Bristol on 9 June with reduced rates for IHBC members.
Including the recommendation that ‘the current measure of % of A-listed buildings on the Buildings at Risk Register is replaced with % of pre-1919 dwellings classified as having disrepair to critical elements.’
Originally the ‘Newsletter’ of the predecessor organisation, the ACO, Context is today the historic environment practitioner’s best source for accessible expertise in contemporary conservation.
Director’s top pick this week features a call from Greenham Parish Council for a Project Manager to lead on the refurbishment of the iconic control tower of the former Greenham Common airfield.
The Mount Pleasant Neighbourhood Forum has submitted the Order as the group intends to provide 40 more affordable homes than the Royal Mail scheme that has already been granted permission.
The HLF is changing the way it funds places of worship as From September 2017, the current Grants for Places of Worship programme will close to new applications.
Locality, the link group for community-led neighbourhood organisations, seeks to uncover what is needed to reinvigorate local democracy and empower communities.
£250 million scheme to build a three-tower housing complex on the edge of Liverpool’s business district has secured approval.