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Pressure clean sand and stain outdoor deck

indeed

HI All ,

i am starting a DIY project on giving some life to my deck.

i would appreciate any help i can get from this forum .

its a Merbau deck (around 50 sqmts) and am keen to seek this forums advice .

where can i rent a pressure sprayer to first give it a good wash

what sort of sand paper should i be using , coarse sanding (P40 sandpaper) or fine sanding (P280 sandpaper).

finally the water based paint to be applied , Intergrain 1L Water Based Cedar / Cypress UltraDeck ? is this the good =

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Comments

Jason

Hello @indeed and a big welcome to the Bunnings Workshop community. It's wonderful to have you join us, and we are looking forward to seeing you renew your deck as well as complete other projects around the house and garden. Feel free to post whenever you need a hand.

You might be interested in the deck renewal project I shared a few years ago as the deck looks to be in similar condition.

I would be strongly considering hiring a floor sander to complete the project. While the hire shop at your local Bunnings is currently closed due to Covid-19, it will be reopening very soon. If you sand the deck, then you are unlikely to need a pressure washer. However, if you wanted to avoid sanding then you could try a pressure washer first and see how the timber comes up.

I used 40 grit paper for the first sand, then went over with an 80 grit. I used Intergrain Ultradeck to oil the timber after sanding and was very pleased with the results.

Hope that helps get you started. I'm sure other community members will be more than happy to assist. Don't hesitate to ask.

Jason

redracer01

Hello @indeed

Last time I did my deck I sanded it. Using a pressure washer brings up too many fibers and splinters then you end up sanding it any way. My vote Intergrain brand as well.

indeed

https://www.workshop.bunnings.com.au/discussion/comment/8855#Comment_8855

Many Thanks Jason ,

your deck renewal project blog is quite helpful . i will definitely try the floor sander instead of pressure wash and see how it come out .

any water based oil do you recommend ?

Jason

https://www.workshop.bunnings.com.au/discussion/comment/66676#Comment_66676

Thanks for the feedback @indeed. Integrain Ultradeck is water-based.

Jason

indeed

https://www.workshop.bunnings.com.au/discussion/comment/96117#Comment_96117

Thanks Jason ,

do you think i need to apply the cleaner Intergrain 4L UltraPrep Timber Cleaner | Bunnings Warehouse first and then apply the timber oil

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/114655#Comment_114655

Hi @indeed,

Are you planning on sanding the deck? If not, then I would highly recommend you use the UltraPrep cleaner first as the deck is greyed and has patchy colour to it. If you do sand you most likely will not have to use the cleaner.

Mitchell

indeed

https://www.workshop.bunnings.com.au/discussion/comment/125109#Comment_125109

Thanks Mitchell,

yes i am planning to sand it first and would use the Integrain Ultradeck instead .

Will post this group on how it comes out

Brad

https://www.workshop.bunnings.com.au/discussion/comment/8856#Comment_8856

@redracer01was that using a decking brush with the pressure washer or straight pressure wash please?

redracer01

https://www.workshop.bunnings.com.au/discussion/comment/66688#Comment_66688

With pressure wash and brush. It was a family affair!

indeed

https://www.workshop.bunnings.com.au/discussion/comment/96117#Comment_96117

After using 40 grit sand paper

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/114660#Comment_114660

Hi @indeed,

There is still a lot of colour difference, but I see your screws are quite proud on the surface already. I don't see a significant difference after the 40grit sanding, which is what I would have expected. You can either drive those screws in and continue sanding or try the Ultraprep product. Even if you apply the decking oil now it might look fine, it is just about getting the most uniform appearance before coatings as to not end up with a motley deck.

Mitchell

indeed

https://www.workshop.bunnings.com.au/discussion/comment/125114#Comment_125114

Hi Mitchell ,

i did not find much of a difference using the 40 grit sand paper still thinking if am got this correct . i shall be using the 80 grit sand paper tomorrow and see how it comes .

i have hired a floor sander and its quite difficult to do the edges with this and was wondering if i need a detail sander to get the edges done . if so which tool do you recommend to buy , i was thinking of Ozito product https://www.bunnings.com.au/ozito-200w-multi-sander-kit_p0048824

after using the 80 grit sand paper , will see the outcome and decide on the ultrprep product .

Thanks for your inputs .

indeed

https://www.workshop.bunnings.com.au/discussion/comment/125114#Comment_125114

Hi Mitchell ,

do you think i should try the ultraprep product incase the sanding does not work and i do agree with the screws they would need some work . am confused now , should i continue sanding with 80 grit sand paper or instead use the ultraprep deck cleaning to clean, and stain the deck . ignore sanding the deck for now . please let me know your suggestions .

MitchellMc

https://www.workshop.bunnings.com.au/discussion/comment/132134#Comment_132134

Hi @indeed.

I'd personally be giving it another go with the 40grit and spending a bit more time on it. What sander are you using for this, is it a dedicated deck/flooring belt sander? 40grit sandpaper in a belt drive floor sander should be removing considerable amounts of timber. You need to spend some time on it, you do not want to sit in the same spot for too long and gouge a hole, but you also don't want to just skim over the deck. You are looking for a uniform colouring and generally will sand until you have penetrated through the mottled appearance.

You could also just do a test section with the oil in a corner and see what the appearance is like. If you are happy with the appearance then you can just oil the deck as is. The oil will partially disguise the mottled colouring, so you might find further sanding is not necessary.

Once you have a uniform colour to the deck I would then apply the Ultraprep to finish the job before oiling.

Here's a D.I.Y. guide on How To Sand A Deck, which you can see how they achieve a uniform colouring with fresh timber before proceeding.

Mitchell

Jeanagh

Thanks for this, just about to do mine and here are the instructions

BradN

https://www.workshop.bunnings.com.au/discussion/comment/24171#Comment_24171

Hi @Jeanagh, and welcome to the Bunnings Workshop community. It's great to have you here.

I'm glad that you've been able to find the advice that you need.

Are you going to sand and stain a deck? I expect you saw @MitchellMc's link to our D.I.Y. guide on How To Sand A Deck. You might also like to look at this guide and video tutorial: How to restore a deck.

Please don't hesitate to ask any questions. Feel free to start a discussion and keep us updated on your progress. We'd love to see some before and after photos.

Brad

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/74734#Comment_74734

I put too many coats of stain on now its cracked and flaking, so I will take it all off then restain

BradN

https://www.workshop.bunnings.com.au/discussion/comment/101000#Comment_101000

Hi @Jeanagh. I'm sorry to hear that hear that you have a problem with your stain flaking. One of our resident D.I.Y. experts, @EricL, will be back on the site later today, and I'm sure he'll be able to give you some good advice.

Could you possibly post a photo of your deck and the flaking stain so that Eric can get a good look at it?

Brad

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/117411#Comment_117411

EricL

https://www.workshop.bunnings.com.au/discussion/comment/126903#Comment_126903

Hello @Jeanagh

Thank you for sharing those images of your deck. Looking at the photo you posted, I suggest sanding the surface clean. Because you've applied the stain this will need to be sanded off and the surface prepared again. Please make sure to give the first coat enough time to cure.

Here are some handy step-by-step guides:

If you have any other questions we can help with, please let us know.

Eric

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/133212#Comment_133212

Thanks Eric I'll give that a go

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/133212#Comment_133212

So far I've stripped half the deck with timber stripper and it's come up great. Will then sand it all. When it's done I'll send a photo

EricL

https://www.workshop.bunnings.com.au/discussion/comment/137110#Comment_137110

Hello @Jeanagh

Thank you for the update. It would be very much appreciated if you can post a photo of your current progress. I'm sure our members would be keen to see the results of the paint stripping on your deck. It becomes a point of reference and gives them an idea of what to expect once work starts getting done on the deck itself. I'm sure it will look great once you start sanding the surface.

Eric

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/139793#Comment_139793

Will send a picture of it stops raining long enough

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/141641#Comment_141641

So, I'm about 1/3 the way through. Between the rain and my medical limitations it's slow going. Hopefully finish stripping it today ready for sanding when it dries out. Being Melbourne who knows when that will be.

just this bit to go

EricL

https://www.workshop.bunnings.com.au/discussion/comment/143029#Comment_143029

Hello @Jeanagh

Thank you very much for posting your work in progress. That paint stripping is looking excellent and the deck's surface looks very clean. If the rain ever stops and you get a forecast of good weather for a week, that would be the ideal time to repaint or stain your deck. Please remember that the deck has to be totally dry before you apply anything to it.

If you need further assistance, please let us know.

Eric

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/144002#Comment_144002

Thanks for that advice, id like to get it right this time. Will take me a little while to sand it all so.... stay tuned

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/144002#Comment_144002

Quick qst. The wood needs to be completely dry to sand it properly yeah??

BradN

https://www.workshop.bunnings.com.au/discussion/comment/144753#Comment_144753

Hi @Jeanagh . It's great that you're making such good progress on your deck.

As to whether the deck needs to be completely dry before you sand it, @EricL should be able to tell you when he's back on the site later today. I'll also tag experienced Workshop members @TedBear and @JoeAzza for their thoughts.

I think in general you would avoid sanding wet timber because for one thing the wet timber dust would clog the sandpaper.

You might also find it helpful to check out this step-by-step and video guide: How to sand a deck.

Are any of the screws in your deck protruding above the level of the timber? If so you will want to get them screwed back down so that they don't tear your sandpaper.

Brad

Jeanagh

https://www.workshop.bunnings.com.au/discussion/comment/145306#Comment_145306

Thank you and thanks for the tag. Screws are all good. Just got to pressure wash the last section I coated this morning then I can start sanding the dry area. Only have an orbital sander and a finishing so we'll see how we go

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