Cleaning oak beams
I wanted to minimise the use of steel in the building and I like the texture and appearance of untreated hard woods - that led to the importation of two eastern European oak beams for use in the barn.
That long journey (let’s not worry about carbon footprints for now) and a few weeks sitting outside on my yard left their marks on the beams. Both were water stained and blackened and in this state were installed into the barn and the first floor was built ‘on’ them.
Based on a combination of hind-sight and time earned experience here is the MyBarnConversion guide to cleaning oak (hardwood) beams.
If at all possible, clean the beams with a pressure washer prior to installation, that will save a lot of effort later.
If you’re unable to clean the beam before construction, then get out the elbow grease.
- Wash down and scrape the beam to remove surface dirt and mold.
- Use a steamer cleaner to open up the grain and clean into the beam, this will also have the effect of sterilising the wood. A wall paper steam remover will work fine.
- Steam cleaning will begin to bring engrained dirt to the surface. You will find that badly stained wood will need to be scraped to remove the worst of it.
- Using a combination of scraping and washing down (preferably with warm water and detergent) your beam will slowly become clean.
- Rinse and repeat…
- The wood may take some time to dry out, you’ll not be able to tell the final colour and finish until it’s dry, so don’t panic yourself into unnecessary cycles of the cleaning process.
Sand to remove particularly deep stains, splinters and scruffs.
[UPDATE]
I’ve read in a couple of places that sugar soap works well. Will give it ago as I have some other beams that need cleaning.
If you enjoyed that post, then read these...
Oak Beams? ~ You must be barking! on May 14th, 2007
When working through the detailed design for the barn we decided to use oak beams to support the first floor rather than steels.
BREEAM ~ Building Research Establishment Environmental Assessment Method on May 11th, 2008
The term BREEAM is one that I've come across in various contexts over the course of this project and thought I'd better find out what...
My Favourite Things ~ 'Oak Beam' on May 26th, 2008
So far in this series of my favourite things at the barn I've focussed on original features, this is the first of the new features...
VAT for barn convertors - Update March 2009 on March 8th, 2009
It's been a while since a VAT update so I thought I'd review the current position, especially in view of the pre-Christmas credit-crunch fuelled reduction...
Code for Sustainable Homes on May 16th, 2008
The Code for Sustainable Homes is an essential read for anyone considering a sustainable home building project.
Posted in Essential information |










November 29th, 2008 at 7:34 pm
Did you consider the use of oxalic acid? Some friends have used it with success to remove water and iron marks from oak.
February 6th, 2009 at 4:01 pm
The oak beams in our barn are very dry and crumbly is there anything we could use to give them some moisture.
Thank you
A Avery
February 16th, 2009 at 3:16 pm
Alice, I’d try linseed oil or bees wax - test out on a ‘hidden’ surface first.
June 1st, 2009 at 11:34 am
My barn has very grey thin/thick beams with 200 years of age.
they are not wrotten but they are in a bad way.
can i sand blast them?
June 1st, 2009 at 6:22 pm
Sounds like sand-blasting is an option, albeit a potentially messy and costly one. I’d be cautious as sand blasting old wood can lead to a corrugated effect where the blasting eats into the soft parts of the wood-grain. Personally I’d try cleaning (as described here) and additionally sanding them to see how well that works.