Treatment C. Dry Rot Treatment (DRT)
Almost without exception the elimination of dry rot is a two stage process.
Stage 1. Exposure Works
Elimination of the cause of attack (as for WRT) together with exploratory works. These exploratory works, such as the removal of plaster and defective timbers, are designed to establish and define the full extent of the attack. A report of these findings is prepared and then a fixed price quotation for the next stage, viz:
Stage 2. Treatment Works
Owing to the persistent and often hidden nature of the attack by this fungus, it is often necessary to carry out extensive ancillary works in addition to timber replacement. The nature and extent of these will be carefully and unambiguously detailed in the report and will include some or all of the following:-
- The removal of all structurally defective timbers affected by the fungus, possibly with apparently sound timbers up to 1m from the nearest visible decay as determined on site by ATICS.
- The removal of all plaster/rendering within the affected area and up to 1m beyond as determined by our surveyor. This to be followed by the brushing down or vacuuming of exposed brickwork.
- For timber, Surface Treatment with Fungicidal Fluid (STFF) and/or for masonry, a masonry biocide, in a manner and to an extent detailed in the report. For timber this treatment is likely to be restricted to wet, large section timbers at risk and for masonry may include the drilling of holes at staggered centres around the perimeter of the exposed brickwork such as to form toxic barriers through and around the affected masonry.
- Replaster with any cementitious or lime plasters, for example a sand;cement render or `Limelite’ renovating and finish (vermiculite lightweight aggregate and gypsum and lime plaster). Renew any ceiling surfaces using plasterboard together with a finish coat of retarded semi-hydrate board finish such as `Thistle’. Zinc Oxychloride fungicidal plaster can be used in special circumstances in accordance with the manufacturer’s specifications (Preservation Centre for Wood Ltd., 24 Ossory Road, London SE1 5AP).
- For areas not due for plastering, such as reveals, apply two coats of ZOC fungicidal paint to all brickwork to which treatment timbers are to abut.
- Install suitable, treated replacement timbers as detailed in the report.
Our client’s attention is drawn to our Conditions of Contract, a copy of which is issued prior to contract. Our leaflet `A Description of Treatment Techniques’ provides particulars of the above general specifications