Marine Sub Weather

Marine Sub Weather

Sub Floors for Wood Flooring and the Issues surrounding them

Subfloors and the issues surrounding them

A subfloor is what is underneath your present floor covering. Subfloors can become a nightmare if you do not follow the correct procedures because whatever goes on top of the subfloor will be affected by it.

Damp, damaged membranes etc can allow moisture to rise upwards, moisture will always go to the driest part. Our fitters will check the floor for moisture and the surrounding area for humidity to ensure that there will be no problems once the wood floor is laid. The moisture content of the floor screed should be checked along with the relative humidity.

If the following procedures are followed then you will be providing the right environment for a beautiful natural floor that should last a lifetime and you will not get “cupping” or warping problems which only occur where there is excessive moisture. Cupping is where the edges of the boards curl up.

Types of Subfloor 

There are 5 basic types of sub floors upon which we fix hard wood flooring

• Concrete screeds, power floated floors
• Joists
• Ground floor joists with open air below which are found in old houses that have air bricks and probably earth underneath
• Old floor boards
• Chipboard or plywood structure
• Underfloor Heating Screed

Concrete: Concrete screeded floors can vary in condition and levels. If it is flat and smooth with a moisture content of 4% or less then we can glue the boards directly to the floor using the Bona R 850 this is always the best way rather than using an underlay and floating the boards.

If your subfloor is not flat and smooth you can use self leveling compounds but be aware that they can lift if you do not have the right one and it is not applied correctly.

If you have your own builder or fitter please make sure they are experienced in fitting floors and the consequences of not following the correct procedures for concrete screeds.

To be extra cautious you should always put a Damp Proof Membrane (DPM) like the Bona R580 on any concrete screed, concrete takes 10 years to completely dry out and if the membrane underneath cracks for any reason such as subsidence which can happen in long dry spells of weather then moisture can work through the screed and affect the floor. Also by using a DPM you will be protecting the floor even if the screed has not fully dried out on the bottom.  

Joists: If you are fixing floor boards directly to joist you can either use secret nails or screws. These are applied using a purpose made nailing gun or screw fixer which is set at a predetermined angle so that the groove of the next board can be fitted up without the screw or nail showing.  

The joists must be in good condition and free of any wood worm, damp decay, dry rot or any other fungal type disease that can affect their integrity.  

Older homes in the Victorian and Edwardian era had joists over open ground with air bricks if the circulation is blocked then it can lead to serious damp problems. If you have enough height then a plywood base using 8’ x 4’ marine plywood can be screwed to the joists and the floor boards glued directly to the plywood. This will cut out drafts and prevent the damp air affecting the boards. If you do not have the height due to the levels in the house then you must always use an engineered board and ensure that all the ventilation openings and air bricks are clear

Old Floor Boards: Generally old floor boards will be pine or cheap softwood.  If these boards are sound, free of dry rot and fungus, then a new engineered hardwood floor can either be secret nailed, screwed or glued directly on to these boards.

If the boards are loose then it would be best to screw them firmly into the joist. If necessary an acoustic and thermal underlay can be placed between the two layers of wood when nailing or screwing down, this will reduce noise levels including creaking and helps to reduce the transmission of cold air from below.

 If you are unsure then our fitters would be happy to make a site visit to ascertain the best way of fixing your floor

Chipboard or Plywood Floors: Chipboard and ply wood sub bases are the ideal surfaces to fit a hardwood floor. You will be able to choose any of our wooden floors and on plywood they can be nailed, screwed or glued, but on chipboard due to it being particles of waste wood, glue nails and screws would not hold properly over time so it is always best to glue the floor boards down.

Underfloor Heating: This is a specialist area and should be treated with care. There are many different systems but for wooden floors we always think that a hot water system is the best. Electric mats are OK but not as effective. Whatever system you have the manufacturer’s instructions should always be followed. If it is a screeded system then always glue the boards direct to the screed this ensure not heat loss You can find out more in our underfloor heating section.    

 

 

About the Author

This articles was written by Martyn Ryder Managing Director of The Solid Wood Flooring company. We manufacture all our own flooring to our own design and also to specifications given by top Architects and Designers. We supply top quality wood flooring at very competitive prices.

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