Dry Rot Treatments

In Masonry - sterilising walls and floors with Boron

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Summary: Treating Dry Rot with Disodium Octaborate Tetrahydrate (Borax). Treatment with Boron dissolved in water to kill Dry Rot in brick, stone, mortar, concrete, plaster and soil. This Dry Rot treatment is odourless and has no vapour, so is completely safe to apply by brush or low pressure spray.

Why Treat Masonry:

Because Dry Rot can spread under, over and through masonry walls and floors, these can often hide the strands, mycellium skin and fruiting bodies in joints, cracks and cavities. Treatment of any area or void into which strands, mycellium or a fruiting body of dry rot is growing must continue at least 300mm in all directions, to avoid missing any of the tiny micro strands that precede the main visible parts of the fungal growth.

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IS IT REALLY DRY ROT - first identify the rot type in order to decide the extent of the treatment

1. Strands - fibres like small plant roots, dirty off-white to silver grey in colour.

2. Sheets - Mycelium - dirty off-white skin, can be tinged with yellow, occasionally found as billowing cushions of off-white growths.

3. Mushroom - Fruiting Body - this produces the Spores - rust red in colour, can spread around onto other surfaces, usually found as a flat body with red spores in the centre and an off-white rim.

Dry rot in a skirting board

Dry Rot - large splits, curvature and strands.

Dry rot Mycellium on wood - dirty, off white colour

Mycellium on wood - NOT brilliant white.

Amazing fruiting body of Dry Rot showing the rusty red spores

Dry Rot Sporophore - flat & red rust coloured.

NOT DRY ROT - THEN IT IS ONE OF MANY WET ROTS - most commonly misidentified features

1. Coniophora puteana - the 'cellar fungus' - dark brown to black strands in fern-like patterns, olive brown fruiting body (rare).

2. Fibroporia vaillantii - white strands in fern like growths, white fruiting body with pores.

3. Asterostroma - brilliant white, fine strands, fruiting body has no pores, mycelium has tiny star structures, visible only under magnification.

Dark brown to black strands of Coniophora Puteana, looking like plant roots, fern like.

Wet rot - brown to black strands of Coniophora.

Brilliant white strands of Fibroporia on a joist.

Brilliant White strands and Mycellium of Fibroporia

Brilliant white skin of Fibroporia growing in very wet conditions.

Brilliant White strands and Mycellium of Fibroporia - both Wet Rots - NOT Dry Rot.

IDENTIFIED DRY ROT - Boron treatment

The best, safest and most pleasant treatment to apply is Boracol 10 , a water based 'biostat' that has no adverse effect on non-wood boring insects or mammals (like Bats). This Boron Products is applied as two or more coats by brush or spray and soaks quickly into the masonry and any adjacent timber. It is permanent and, unlike its main rivals, it has no vapour and no smell. It can only affect wood rotting fungi and wood boring insects, so Bats (a protected species) are not affected - their main food, the house fly, does not eat wood and so it never contains any preservative. Heavily infested areas of timber, and damp patches, should also have an application of B2 Gel, to reduce the risks of future rot and provide extra active ingredient. Permanently or seasonally damp wood needs injection with B40 Injection Gel (for example, window frames, garden posts, door frames).

The so called 're-entry time', set by the HSE for every Pesticide, is 48 hours or until dry. Pet birds and fish are not at risk from Boron-based preservatives when used as specified (minimum of 48 hours r re-entry time, or until dry)


The photograph below shows untreated panels, on the left and treated panels on the right. The treated panels (in two columns) have been painted with Dry Rot Paint and show no signs of growth!


Anti Dry Rot Paint, showing the Building Research Establishment test panels - treated panels on the far right.

So, you can further reduce the risk of future Dry Rot attack by using this 'No Go Zone' special emulsion paint. It can be applied behind skirting boards, in window frame reveals and in joist sockets. The paint, which has been tested by BRE (Building Research Establishment - Government backed test Authority) prevents Dry Rot from passing across treated areas. No other treatment can currently offer this feature.

If you need any help with any type of Wood Treatment or identification of wood rotting fungi Property Repair Systems staff will be pleased to give you completely free, no obligation advice on 01626 872886 .


RING US FOR HELP TO IDENTIFY YOUR FUNGUS - 01626 872886 - Fungus Help Line

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Site written by: David Moore

David Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author