You lift the carpet in an older house expecting to find timber floorboards, only to discover another layer underneath. It may be hardboard or plywood, and suddenly the job looks a little different from the one you had planned.
Finding sheet material over old boards does not automatically mean the timber underneath cannot be restored. Equally, seeing a promising strip of old pine at the edge of the room does not mean the whole floor is ready for sanding.
The condition of the floorboards is what matters. Before choosing a floor sander, abrasives or a finish, you need to uncover enough of the floor to understand what you actually have.
Why is there hardboard or plywood over the floorboards?
Finding hardboard or plywood over floorboards can be confusing, particularly if uncovering the original timber was part of your renovation plan.
The covering itself does not tell you what condition the floorboards are in underneath. You may find boards that are suitable for restoration, or you may uncover repairs, movement, old coatings or other issues that change the job. That is why it is better not to make assumptions from the first exposed section.
If you want the original boards to become the finished floor, the first stage is simply to find out what is there. Once enough timber is visible, you can make a much more informed decision about whether restoration is realistic.
Does it matter whether it is hardboard or plywood?
The difference between hardboard and plywood can matter when you are working out what has been fitted and how it needs to be dealt with, but you do not need a full materials comparison before assessing the floor underneath.
If you have found hardboard or plywood under carpet, vinyl or laminate, the practical question is much the same: what condition are the original floorboards in once enough of them are exposed?
Knowing what is covering the floor can help you understand the job in front of you, but the restoration decision should ultimately be based on the timber beneath it.
If you are not sure what the sheet material is or how it has been fixed, establish that before trying to remove it. Guessing is not a good basis for a restoration project where the surface underneath is the part you want to preserve.
Is it worth uncovering the original floorboards?
If your aim is to restore the original timber, it is usually worth uncovering enough of the floor to see what condition it is in. That does not mean every old floor should automatically be stripped back and sanded.
A small area beside the wall may look excellent, while another part of the room may have been repaired or may be in a different condition. Until you can see a representative section of the floor, you are working from an assumption rather than the floor itself.
This is particularly relevant in Victorian, Georgian and other period properties, where uncovering original boards can be one of the most appealing parts of a renovation. It is easy to become attached to the idea of a restored timber floor before you know whether the boards are suitable.
Whether the project is worth continuing should come down to the condition of the floor as a whole.
What might you find underneath?
Once the covering is removed, you can finally see what sort of restoration job you have.
Some floors may reveal boards that appear sound and suitable for further assessment. Others may contain previous repairs, loose or unstable sections, exposed fixings or visibly damaged areas. You may also uncover old coatings such as varnish, wax, paint or bitumen.
More serious problems can change the project entirely. Signs of moisture, rot or structural movement need to be considered before sanding goes any further.
The important thing is to distinguish normal signs of an old floor from conditions that need attention before restoration continues. A previous repair does not automatically rule out sanding the floor, but loose boards, deterioration or movement should not simply be ignored because the timber looks attractive.
If you uncover something you are not confident about assessing, that is a good point to stop and get appropriate advice.
Before you start lifting the covering
If the original boards are the surface you hope to restore, the way you uncover them matters.
Start by looking at what is already visible. Check whether any areas of the covering are loose, whether fixings can be seen and whether part of the original timber is already exposed. The aim is to understand how the floor has been covered before you start trying to lift anything.
There is no single removal method that is appropriate for every floor. How the material has been fitted will affect how it needs to be dealt with.
For that reason, avoid treating removal as a race. Forcing up sheet material without understanding how it has been secured can create more work on the floor you are trying to preserve.
If the fixing method is unclear, or the floor appears unstable as you begin uncovering it, establish what you are dealing with before continuing.
Can you sand floorboards after removing hardboard or plywood?
If the exposed boards are stable and suitable for restoration, sanding can be the natural next stage. Removing hardboard or plywood only gives you access to the timber. It does not tell you what sanding process the floor needs.
Before starting, look across the room and consider the condition of the boards. Remaining fixings, previous repairs, loose areas and old coatings can all affect what needs to happen next.
This is also why copying a generic abrasive sequence is not a good approach. An old floor with a previous coating may need to be treated differently from another timber floor that appears similar at first glance. The floor, its condition and its existing surface should guide the sanding plan.
Preparing uncovered floorboards for sanding
Once you are satisfied that the boards are suitable for restoration, inspect the room methodically before bringing in the sanding equipment.
Do not look only at the large open area in the centre. Pay attention to edges, corners, doorways, narrow hallways and any sections that have previously been repaired. Conditions can vary across the same room, particularly in older properties.
This is also the point to make sure that anything which could interfere with sanding has been dealt with. A floor sander should be used on a suitable timber surface, not as a way of solving movement, instability or underlying deterioration.
If this is your first DIY floor-sanding project, our floor sanding tips are a useful next step before choosing machines or abrasives. Taking the time to understand the whole floor now will make the sanding stage much easier to plan.
Common mistakes when uncovering old floorboards
Assuming original boards are automatically worth restoring
Old floorboards can be a lovely feature in a period property, but their age alone does not tell you whether they should become the finished floor. The condition of the boards should guide that decision.
Judging the whole floor from one exposed section
A clean-looking strip beside the wall may not represent the rest of the room. Uncover enough of the floor to understand the overall condition before committing to restoration.
Treating sanding as a repair process
A floor sander is there to sand suitable timber, not to fix underlying problems. Loose boards, structural movement, rot or other issues need to be dealt with separately before sanding begins.
Choosing abrasives too early
Old varnish, wax, paint, bitumen and other previous treatments can affect how the floor needs to be approached. Work out what is actually on the boards before deciding on a sanding sequence.
What if the floor underneath is not suitable for restoration?
You may find that parts of the floor need more attention than expected, or that restoring the original timber is not the best option for the room. That can be disappointing if you had pictured a freshly sanded period floor, but finding out before you hire equipment is far better than discovering it halfway through the job.
Even if the boards are not suitable for the finish you had in mind, you now know what the room actually needs. Old-floor restoration is much easier to plan when decisions are based on the floor in front of you rather than on what you hoped was hidden underneath.
What floor-sanding equipment will you need?
Once you know the floor is suitable for sanding, you can start thinking about equipment. There is no single machine that suits every old wooden floor, so the condition of the boards, the existing surface and the shape of the room should guide your choice.
If this is your first DIY project, start with our floor sanding tips to get a clearer idea of what the sanding stage involves.
You can then explore our floor sanders and belt sanders once you know what you are working with.
If you are still unsure, speak to the team before hiring. It is much easier to choose the right equipment when you can describe the condition of the timber you have actually uncovered.
Frequently Asked Questions
Not necessarily. Original boards can be an attractive feature in a period property, but the decision should be based on their condition and the result you want from the room. Uncovering them gives you the information you need to make that choice.
Potentially. A previous repair does not automatically make the entire floor unsuitable. What matters is the condition and stability of the repaired area compared with the surrounding boards. If earlier work raises questions about whether the floor can be sanded safely and consistently, assess it before starting.
Loose or unstable boards need attention before sanding. A floor sander will not correct movement in the timber, so the cause should be understood before you continue with the restoration.