I often come across properties that need additional sub floor ventilation. It is quite common for a building surveyor on a pre purchase survey to note the lack of sub floor ventilation, and recommend more sub floor ventilation.
One thing I always bang on about is multiple issues with buildings, that can contribute to the symptoms. I say this because a particular issue I often see is the where just sub floor ventilation is increased by installing new air bricks / new sub floor vents. I also see that even when ventilation has been increased and subsequent timber repairs have been carried out, issues with dry rot or wet rot occur again. Sometimes what happens is a damp and timber surveyor inspects the building, and makes the recommendations and doesn’t evaluate the issue to find the root cause, and presumes that the issue is just sub floor condensation. Visibly it might seem to be just sub floor condensation, but how would you know if the excess moisture beneath the floor causing the sub floor condensation isn’t a drain defect? The only way you would know is if a CCTV drain survey has been carried out to eliminate all potential drain defects.
Dry rot and wet rot beneath sub floors occur simple because of moisture excess. What you have to think about is the absolute basics. Now why after perhaps 100 or even 60 years why is the floor suffering from timber decay now? Something has tipped the balance and that will normally be moisture. Well most of the time when I have inspected these properties to find the root cause it is most likely perhaps blocked sub floor ventilation, or drainage defects.
If you wish to have a long term solution you need to start with the basics rather than having a cover up job. CCTV drain surveys are obviously not free, but this can be the most valuable part of any building survey.
A recent survey survey where there has been a long term issue with suspended timber floor decay, I found many contributing defects. Nearly 17 meters away from the man hole I found this defect with the CCTV drain camera that was restricting the drain and causing the drain to back up. This is where a metal stake has been smashed though the drain, which was used to support a fence post. Where there was displaced joints within the drain also, this was causing water to actually leak into the adjacent subsoil next to the property, and subsequently causing timber floor decay.
I was only called in when my client had lost faith with the previous surveying and contracting company, as they didn’t really offer any sensible advice why timber the floor started to rot again. As you can imagine they were very concerned as the stairs started to drop along with rest of the ground floor flooring. Fortunately for them they had searched on Google and come across a couple of posts on the website.
If you need an investigation as to why you have issues with a rotten damp floor, we can help with identification of either dry rot or wet rot. We can also carry out the CCTV drain survey along with any drain patching, and drain lining. We can also carry out the installation of any additional sub floor ventilation, and any timber repairs to the floor.
Please remember we don’t offer free surveys. Surveys fees depend on the issues you have, and what time and equipment is needed on site. More than happy to discuss this over the phone prior to the survey. Or you can email your enquiries to firstname.lastname@example.org