Home / Advice / What underlay do you need for an engineered wood floor?
What underlay do you need for an engineered wood floor?
The right underlay depends on how the engineered boards are fitted and what is underneath them: a floating floor needs underlay, while a fully glued floor usually does not. On concrete or screed, ask about a damp-proof layer, and check the board maker's instructions before you buy anything.
Last reviewed:Does every engineered wood floor need underlay?
Not every one. It depends on how the boards are fixed.
- Floating. The boards are joined to each other by a click or glued tongue and sit on top of an underlay, not fixed to the floor below. A floating floor always needs an underlay.
- Fully glued. The boards are stuck straight down to a prepared screed, concrete or plywood subfloor. The adhesive takes the place of an underlay, so one is not normally used.
- Secret nailed or screwed. The boards are fixed through the tongue to timber joists or a plywood deck. Some makers allow a thin layer underneath, others do not.
The board maker's fitting instructions are the place to start. They usually say which methods are allowed for that product and what should go underneath. A fitter who has read them can tell you quickly.
QuoteZila starts in Cheshire, with Crewe, Nantwich and Sandbach first, and anyone in the UK can post a flooring job.
What does an underlay actually do under wood?
An underlay under a floating floor has several jobs at once.
It evens out tiny dips. It will not fix a floor that is out of level, but it smooths very small bumps so each board sits evenly.
It cuts noise. Footsteps on a hard floor carry into the room below. A good underlay softens the sound in the room itself and reduces what travels down.
It keeps damp away from the boards. On a concrete or screed floor, moisture can rise from below. Some underlays have a damp-proof layer built in, and some floors need a separate membrane laid first.
It helps the floor feel solid. The right underlay stops a hollow, clicky feel underfoot.
No single underlay is right for all of these. The choice is about which jobs matter most in your room.
How does the subfloor change the choice?
Concrete or screed. Ask the fitter how they will deal with damp. A new screed must be dry enough before any wood goes on it, and the maker's instructions usually say how that should be checked. A damp-proof layer, built into the underlay or laid separately, is normally part of the job.
Timber floorboards or chipboard. A suspended timber floor needs air moving underneath it, so the fitter should not seal the room off in a way that traps moisture. Loose or squeaking boards should be fixed before anything goes on top. Our suspended floor page explains how those floors work.
Old tiles or vinyl. Sometimes a floor can go over them if they are flat and firmly stuck. Sometimes they have to come up. Ask which the fitter is pricing.
Cutting engineered boards and sanding old floors makes fine dust. HSE's woodworking guidance says wood dust can cause serious health problems [S1]. Ask the fitter how they will cut indoors and keep the dust down.
What about flats and underfloor heating?
Flats. Footsteps on a wood floor can be heard in the flat below. Some leases have rules about hard floors and what must go underneath. Read your lease, or ask the managing agent, before you order the boards or the underlay.
Underfloor heating. Underlay slows heat passing up into the room. If you have underfloor heating, choose an underlay the heating and board makers both say is suitable, and keep the paperwork. A fitter should be able to show you that the combination is allowed. The underfloor heating guide covers that job.
Who should fit it, and what should the quote say?
Our flooring fitters page covers the trade. Some carpenters and joiners also lay engineered wood, especially on timber floors. Wooden flooring costs explains what changes the price of the whole job.
Ask each quote to name the fitting method, the underlay or adhesive by product, any damp-proof layer, the preparation of the subfloor, and how the edges and doorways will be finished. Citizens Advice suggests getting written quotes from at least 3 different traders before you decide on one [S3].
Jobs you might post
These are examples, not taken from real job posts.
- "Engineered oak to go in the lounge over a concrete floor. I have the boards. Please quote for a suitable underlay with a damp-proof layer, and fitting."
- "First-floor flat, engineered wood in the living room. The lease has rules about hard floors. Please say which underlay you would use and why."
- "Kitchen-diner with water underfloor heating. Please quote to supply and fit engineered boards and an underlay both makers allow."
QuoteZila is free for customers and local businesses [QZ1]. Your job goes to up to five matched local businesses [QZ2].
Honest status: QuoteZila is new. We're starting in Cheshire, beginning with Crewe, Nantwich and Sandbach, and growing area by area. Anyone in the UK can still post a job or register a business. How fast you get quotes depends on how many local businesses have joined near you. Businesses can register and receive jobs straight away. We don't check insurance, qualifications or registrations, so please check these yourself before you hire.
Posting a job is not open yet
Questions about engineered wood floor underlay
Can I reuse the old underlay from my laminate or carpet?
Carpet underlay is the wrong product for a wood floor, because it is far too soft and the boards will flex. Old laminate underlay may be flattened, torn or the wrong type for the new boards. Most fitters start with fresh underlay so the floor is laid on a known surface.
Does a glued engineered floor need underlay?
Usually not, because the boards are stuck straight to a prepared subfloor. The adhesive system then does the job an underlay would, and the subfloor preparation matters even more. Ask the fitter which adhesive they will use and whether it is the one the board maker names.
Is thicker underlay always better?
No. Too thick or too soft an underlay lets a floating floor move, which can strain the joints between boards. The board maker usually says which types and thicknesses suit their product. Follow that rather than picking the thickest roll in the shop.
Who takes away the old floor and underlay?
Agree it before work starts. GOV.UK's waste code says a tradesperson who works on your property is responsible for the waste they produce, and the cost of its disposal should be included in what they charge.
Does QuoteZila check flooring fitters?
No. We don't check insurance, qualifications or registrations, so please check these yourself before you hire. You can report a quote or a business from your job page.
This page is general information, not professional or legal advice. QuoteZila does not check Gas Safe, WaterSafe, NFRC, NICEIC or other registrations against the register on your behalf: look them up yourself.
Part of Advice. All services
Related trades
Cost guides
Related pages
- Filler for floorboard gaps: what to use. How to choose a filler for floorboard gaps in a Cheshire home, when a tube sealant is enough, and when a joiner should see rotten or moving boards.
- How to Measure Carpet for Stairs. How to measure a staircase for carpet: treads, risers, the nosing wrap, winders and the landing, written down so a carpet shop or fitter can check your sums.
Sources
- QZ1: QuoteZila product fact. QuoteZila home and FAQ copy.
- QZ2: QuoteZila product fact. QuoteZila FAQ How does getting quotes work.
- S1: Wood dust, Health and Safety Executive. Accessed 2026-11-01. https://www.hse.gov.uk/woodworking/wooddust.htm
- S2: Waste duty of care: code of practice, GOV.UK (Defra). Accessed 2026-11-01. https://www.gov.uk/government/publications/waste-duty-of-care-code-of-practice/waste-duty-of-care-code-of-practice
- S3: Before you get building work done, Citizens Advice. Accessed 2026-11-01. https://www.citizensadvice.org.uk/consumer/getting-home-improvements-done/before-you-get-building-work-done/