this is what the surveyor will check:
Why is rising damp a problem?
Any plaster products 1 meter above the damp course are at risk if the damp course fails
Any timber products below the damp course are at risk
Any timber products 1 meter above the damp course are at risk if the damp course fails
Any weaker bricks up to 1 meter above the damp course are at risk if the damp course fails
It is assumed that the damp course on a new house will be effective for 30-years, after which a new damp course will need to be inserted to prevent any soluble salts from rising past the damp course.
If soluble salts pass the damp course, it will contaminate the walls. A new damp course will need to be installed to prevent any new salt from rising and the contaminated walls will need to be covered with a waterproof render.
A new damp course can save you the time and expense of hacking the contaminated plaster off and re-plastering using waterproof rendering and then plastering.
As a guide ~ per meter
|Remove contaminated plaster||£15|
So a damp course at £15 per meter is 4 times cheaper than the full damp treatment at £60 per meter.
this is what the surveyor will check:
Small wood boring insects:
|Common Furniture Beetle, Bookworm||Ambrosia beetles, Pinhole borers||Powder post beetle||Bark borer, Waney edge borer||Death watch beetle||Pest|
|Anobium Punctatum||Ambrosia beetles, Pinhole borers||Lyctus Brunneus||Ernobius Mollis||Xestobium Rufovillosum||Ptilinus Pectinicornis|
|Type||Small insect||Small insect||Small insect||Small insect||Small insect||Small insect|
|Sapwood of Soft and Hardwood, not tropical||Soft and Hardwoods, freshly fallen logs||Sapwood of wide pored Hardwood e.g. Oak, >3% starch||Softwood, must have bark present||Hardwood with decay present e.g. Oak, Elm||Sapwood of some European Hardwoods in wood yards
|Spreads||Flight, modern plywoods and tropical Hardwood is immune||Flight, Is a forest insect||Flight, only to <10 year old timbers||Flight||Flight to neighbouring Softwood if decaying||Flight, stays in timber yards in seasoning wood|
|Severe tunnelling, mainly along grain, light side can be undamaged||Blue, black tunnels across the grain.||Severe tunnelling, mainly along grain to start, surface left||Mainly to the bark, some shallow holes in wood||Extensive internal tunnelling, Can be with Donki white rot.||Severe tunnelling, mainly along grain to start, surface left|
|Gritty lemon shaped pellets, uniform colour, can be knocked out||none||Lots of frass can be shaken out, smooth flour like||Gritting bun shaped pellets, light (sap) and dark (bark) colours||Very gritty, plenty of frass, large bun shaped, visible to naked eye||Hard compacted frass, flour like|
|Tunnels||Round, tend to run with grain||Round||Round, joining tunnels, along grain to start||Round mostly in bark||Round||Round but full of frass|
Other wood boring insects:
|Wood boring weevils||House Longhorn||Forrest Longhorns||Wood Wasp||Wharf Borer|
|Pentarthrum Huttoni / Euophryum Confine||Hylotrupes Bajulus||Forrest Longhorns||Urocerus Gigas||Nacerdes Melanura|
|Type||Small insect||Large insect||Large insect||Large insect||Large insect|
|Very decayed Soft and Hardwoods||Sapwood of Softwoods||Green Soft and Hardwood||Softwood, fresh logs, unhealthy trees||Severely decayed Hardwood and Softwood|
|Spreads||Flight||Flight||Flight, Forrest insect does not attack seasoned wood||Flight, Forrest insect does not attack seasoned wood||Flight|
|Tunnels along the grain, frequently breaking the surface||Severe tunnelling, leaves veneer of corrugated wood on surface||Single tunnels running into wood||Single tunnels running into wood||Severe tunnelling|
|Gritty lemon shaped pellets, uniform colour, can be knocked out||Sausage shaped pellets, loose, shakes out||Very little, but coarse fibrous chewings||Tunnel is packed with fibrous frass, hard to dig out||Mud like frass and coarse fibres|
|Tunnels||Round and ragged, breaking surface||Oval, large, ridges on tunnel surface||Large oval||Large round||Oval, ragged|
There are four main causes of damp in your home:
See the table below for a detailed look at the main types of rots that can damage your timbers.
|Common Name||Dry Rot||Cellar Fungus||Mine Fungus||Paxillus|
|Latin Name||Serpula Lacrymans||Coniophora Puteana||Antrodia Fibroporia Vaillantii||Paxillus Panuoides|
|Targets||Softwoods||Hard and Softwoods||Softwoods||Very damp Softwood|
|Spreads||Over damp surfaces, and in masonry and soil,||Limited growth over damp masonry||Over damp surfaces, and in masonry||very damp timbers|
|Damage to wood||Cuboidal, large cubes, deep cracking||Cuboidal, internal with sound surface skin||Cuboidal, not as deep as dry rot||Cuboidal deep, wood has yellow cheese appearance|
|Growth (Mycelium)||Silky grey, patches of lilac and yellow peels like as mushroom||Rare, olive brown to black||Pure white, can have light orange patches||Yellow, wool like, tinges of violet may develop|
|Strands||Grey, tough, brittle when dry||Olive brown to black, fine, delicate, not brittle when dry||Pure white, remains flexible when dry, fast growing||Yellowish in colour and thin|
|Sheets||Fawn to creamy sheets and fluffy cotton wool growths||Olive brown to black, only under humid conditions, white in early stages||Fern like||no|
|Fruit Body (Sporophore)||Fleshy pancake with white margin.||Rare, thin olive brown plate cream margin, lumps on surface||White, fleshy up to 15mm||Yellowish in colour , fleshy funnel can be many|
|Fruit body Pores||Reddy brown, wide, shallow pore.||Small angular pores, honeycomb appearance||Gills that divide into 2|
|Spores||Orange dust on nearby surfaces|
|Common Name||Donki||Phellinus||Astero||Oyter Fungus|
|Latin Name||Donkioporia Expansa||Phellinus Contiguus||Asterostroma spp||Pleurotus Osteatus|
|Targets||Hardwood, Oak||Hard and Softwoods||Softwoods||Panels|
|Spreads||Panels and particle boards in buildings|
|Damage to wood||Coarse fibrously, Internal damage and bleaching of wood||Coarse stringy fibrously, Bleaching of wood||Coarse stringy fibrously, Surface appears weathered||wood panels separate, lighten in colour|
|Growth (Mycelium)||Reddish brown thick felt like growth, can have dark droplets||Chamois leather, rough.||Pinkish grey sheets as fruit body||White woolly mat|
|Strands||None||None||Pinkish grey, fine and tough, long||None|
|Sheets||no||Brown tufts in rotted wood||Pinkish grey sheets||White woolly mat|
|Fruit Body (Sporophore)||Brown, woody contours||Brown, woody contours||Pinkish grey sheets as growth||Fleshy mushroom, deep blue grey with fawn head, if stork, to one side|
|Fruit body Pores||Internal, in cross section||Finely rolled corrugated paper, fine hairs||Whitish gills|
|Spores||Spores on growth not fruit body|
******The cost is less than you think for you entire house, garages, sheds, even roofs.