I did not know that...
 

I did not know that.

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Just watching Garden Rescue on TV and they are putting a bit of decking down. The guy sorting the decking explained that the groves should actually be on the underside of the decking. They are to allow air flow between the decking and the wood it is mounted to, to reduce rotting. They aren't too prevent the wood being slippery under foot which is what I'd always assumed, in fact the grooves allow water to puddle making the situation worse. 

As sad as it is I found all this pretty interesting as I don't think I've ever seen decking in gardens without the grooves being on the top.

Yep, this is as interesting as my life gets these days. 😁

 


 
Posted : 13/01/2026 12:34 pm
ThePinkster, theomen, nicko74 and 2 people reacted
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See also... Concrete slabs...

That little pattern of "grip bumps" is the mould pattern. The other side is the side that is supposed to be upwards.

 

 


 
Posted : 13/01/2026 12:49 pm
 Drac
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You might find this interesting.

https://gripdeck.co.uk/should-grooved-decking-face-up-or-down/


 
Posted : 13/01/2026 12:50 pm
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For your Amazon wishlist? 😉 

image.png


 
Posted : 13/01/2026 12:51 pm
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^^ I genuinely call my son in the evenings sometimes to tell him all about the discoveries I make during the day. Bless him, he usually doesn't take the pee out of me. Usually! 😁


 
Posted : 13/01/2026 12:56 pm
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But don't the grooves have to lined up in the direction of the wind?

If they are 90 degrees to the wind it causes turbulence and the decking vibrates.


 
Posted : 13/01/2026 12:57 pm
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Posted by: Poopscoop

They are to allow air flow between the decking and the wood it is mounted to, to reduce rotting.

Seems pretty pointless considering the surface area of the decking still in contact with the supports and the number of holes right through the decking made by the screws. 


 
Posted : 13/01/2026 12:59 pm
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You might find this interesting.
 
Funnily enough been doing some googling and although many manufacturers/trade bodies do say the groves should have down, it's not universal. Inevitably (me being a saddo) I find even this fact interesting. Lol

 
Posted : 13/01/2026 1:00 pm
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I put mine grooves down as it doesn't improve grip at all to have them up and it's easier to clean and therefore prevent it getting slippery in the first place.

And more importantly it looks better. People who have the grooves up probably hanging their toilet paper against the wall. Enough said! 😂


 
Posted : 13/01/2026 1:08 pm
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It makes no real difference. It just gives the people the option of smooth or groovy decking.

I think it does help prevent boards warping a bit but not certain on that.


 
Posted : 13/01/2026 1:11 pm
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probably hanging their toilet paper against the wall.

 

So it's not just me that really has issues with that?! It's just 'wrong' isn't it?😁👍


 
Posted : 13/01/2026 1:13 pm
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Posted by: Drac

You might find this interesting.

For their actual product it would be pretty stupid to have the griptape on the bottom


 
Posted : 13/01/2026 1:14 pm
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Mine has patterns (grooves, ridges) on both sides?


 
Posted : 13/01/2026 1:25 pm
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 Drac
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Posted by: desperatebicycle

For their actual product it would be pretty stupid to have the griptape on the bottom

Or the water channels on the bottom. 


 
Posted : 13/01/2026 1:31 pm
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Surely the grooved side improves grip (however small)?

 

In other random things I didn't know, I only realised recently that Norman Cook was in the Housemartins...


 
Posted : 13/01/2026 1:32 pm
 Drac
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Posted by: DaveyBoyWonder

In other random things I didn't know, I only realised recently that Norman Cook was in the Housemartins...

Next you’ll be saying he is a Superstar DJ.


 
Posted : 13/01/2026 2:07 pm
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Posted by: theotherjonv

Mine has patterns (grooves, ridges) on both sides?

Link above covers that. "Relief grooves".

 


 
Posted : 13/01/2026 2:09 pm
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Mine has patterns (grooves, ridges) on both sides

Me too. I sought these ought so no-one on the internet could tell me that I'd installed it the wrong way up.


 
Posted : 13/01/2026 2:10 pm
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Posted by: theotherjonv

Mine has patterns (grooves, ridges) on both sides?

Decking or toilet paper? I'm struggling to keep up with this fast paced discussion

 


 
Posted : 13/01/2026 3:32 pm
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Me too. I sought these ought so no-one on the internet could tell me that I'd installed it the wrong
 
I actually had a chuckle at that because it's so bloody true! I bet if you posted pictures on here there would *still* be a discussion on whether you've got the wrong grooves facing up. 😁

 
Posted : 13/01/2026 3:43 pm
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Posted by: theotherjonv

Mine has patterns (grooves, ridges) on both sides?

Schrodingers decking.
You have to fit it first before you can observe whether it's the correct way up.


 
Posted : 13/01/2026 3:46 pm
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^^ Genuine lol, very true again. 😁


 
Posted : 13/01/2026 3:49 pm
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They're not relief grooves, they're a user choice, like these: https://www.chilterntimber.co.uk/product/softwood-decking-winchester-decking-27-x-144mm/

 

I had mine 'relief' side up but then some started to fray around screw holes so I redid turning it over (cheapskate) in the hope of getting another few years out of them, so I'm now groove side up. Which ironically is a relief because kneeling on the relief side made funny marks in my knees.


 
Posted : 13/01/2026 4:01 pm
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Posted by: branes

Posted by: theotherjonv

Mine has patterns (grooves, ridges) on both sides?

Link above covers that. "Relief grooves".

 

... for her pleasure.

 


 
Posted : 13/01/2026 4:13 pm
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Thanks to a dull thread about decking, I'm now occupied by the implantation of a Deee Lite earworm while pondering the revelation that Fatboy Slim is an ex Housemartin. It's like being at the the summit of the capabilities of the human mind.

From wikipedia: After Beats International disbanded in 1992,[13] Cook's marriage ended and he suffered a mental breakdown.[14] According to Cook, he became a self-destructive workaholic, drank heavily and alienated his friends. When therapy was ineffective, he began self-medicating with ecstasy.[2] Facing bankruptcy, he took work composing for a Smurfs video game.[14]

 

 


 
Posted : 13/01/2026 4:13 pm
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Posted by: Drac

Posted by: DaveyBoyWonder

In other random things I didn't know, I only realised recently that Norman Cook was in the Housemartins...

Next you’ll be saying he is a Superstar DJ.

Now you're being silly.

 


 
Posted : 13/01/2026 4:33 pm
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In other random things I didn't know, I only realised recently that Norman Cook was in the Housemartins...

You didn't know that?!

Next you'll be telling me you didn't know Bob Holdness was the sax player on Gerry Rafferty's Baker Street. 


 
Posted : 13/01/2026 5:02 pm
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Posted by: sirromj

Thanks to a dull thread about decking, I'm now occupied by the implantation of a Deee Lite earworm while pondering the revelation that Fatboy Slim is an ex Housemartin. It's like being at the the summit of the capabilities of the human mind.

From wikipedia: After Beats International disbanded in 1992,[13] Cook's marriage ended and he suffered a mental breakdown.[14] According to Cook, he became a self-destructive workaholic, drank heavily and alienated his friends. When therapy was ineffective, he began self-medicating with ecstasy.[2] Facing bankruptcy, he took work composing for a Smurfs video game.[14]

 

 

 

I knew about the Housemartins but I never realised Cook was in Beats International untill this! 

Take 5, posh bun, jam on your kitty, your listening to the joys of Heinz spaghetti - this is Spam, not? - this is Spam, not?

 


 
Posted : 13/01/2026 5:35 pm
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Billy Bragg also in beats international according to wiki . Who knew  . Not me 


 
Posted : 13/01/2026 6:13 pm
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Posted by: tthew

Next you'll be telling me you didn't know Bob Holdness was the sax player on Gerry Rafferty's Baker Street. 

Can't tell if serious...

(He wasn't, and it's "Holness")


 
Posted : 13/01/2026 6:22 pm
 Drac
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Posted by: Sodajim

knew about the Housemartins but I never realised Cook was in Beats International untill this! 

Like some sort of Mighty Dub Kat. 


 
Posted : 13/01/2026 6:29 pm
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Posted by: tthew

 

Next you'll be telling me you didn't know Bob Holness was the sax player on Gerry Rafferty's Baker Street. 

 

the first James Bond

 


 
Posted : 13/01/2026 8:32 pm
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Posted by: theotherjonv

Mine has patterns (grooves, ridges) on both sides?

Yeah but what sealant did you use on your deck?


 
Posted : 13/01/2026 10:07 pm
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Posted by: Drac

Next you’ll be saying he is a Superstar DJ.

There we go!


 
Posted : 13/01/2026 10:52 pm
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I always thought you wanted the grooves up in Scotland as they would obviously afford better grip in snowy and icy conditions. In the south of England flat side up is recommended to provide superior grip in generally drier and warmer conditions. North of Watford and south of the Pennines the general consensus was to alternate grooves and flat, to try and best accommodate all the seasons prevalent in the region. 

 

As you can imagine there are yearly long winded, often heated but dull arguments about the pros and cons on landscape gardening forums throughout the UK. 


 
Posted : 13/01/2026 11:10 pm
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As you can imagine there are yearly long winded, often heated but dull arguments about the pros and cons on landscape gardening forums throughout the UK. 

 

So basically STW-like forums exists in other non bike dimensions which is both fascinating and worrying in equal measure. Lol


 
Posted : 13/01/2026 11:15 pm
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Posted by: Cougar

Can't tell if serious...

Not serious, I do know it's an urban myth. But Chaz and Dave did feature in My Name Is by Eminem, but I think that's fairly common knowledge now.


 
Posted : 13/01/2026 11:47 pm
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Posted by: Poopscoop

probably hanging their toilet paper against the wall.

 

So it's not just me that really has issues with that?! It's just 'wrong' isn't it?😁👍

The original patent for a wall mounted hanger to hold a toilet paper roll specifically designed it so that the loose end hangs down the front away from the wall, primarily to avoid the possibility of dirty fingers touching the wall behind, but it also means that it’s just so much easier to reach! 
Quite why people insist on making life more difficult for themselves by putting something further away when they want to use it is utterly beyond my comprehension! 


 
Posted : 14/01/2026 4:11 am
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Having brought up the toilet paper thing I should clarify that it actually is okay to hang it against the wall. That is if you can answer yes to the following 

1. I live in a trailer park 

2. I'm married to my cousin 

3. I am in a sexual relationship with a farm animal 


 
Posted : 14/01/2026 9:38 am
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Posted by: branes

Link above covers that. "Relief grooves".

Relief that you don't have to choose between grip, rot, wind-direction and warpage 🤣 

 


 
Posted : 14/01/2026 10:42 am
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My missis is a toilet roll from the back freak. More conclusive proof of her actually being wrong, (possibly the one time in her life obviously) when the Christmas bog roll presented upside-down Christmas trees. 

IMG_20181110_000041_DRO.jpgIMG_20181110_000056_DRO.jpg


 
Posted : 14/01/2026 10:50 am
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Nothing says Christmas more than smearing poo over pictures of Christmas trees

 

Honestly. And people laugh at foreigners with their funny bidets


 
Posted : 14/01/2026 11:09 am
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Posted by: tthew

Not serious, I do know it's an urban myth. But Chaz and Dave did feature in My Name Is by Eminem, but I think that's fairly common knowledge now.

One of them did.


 
Posted : 14/01/2026 12:35 pm
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Posted by: tthew

the Christmas bog roll presented upside-down Christmas trees. 

See also: Andrex "puppies on a roll."

(And if you want to be really pedantic, this is STW after all, the patent for the toilet roll holder)


 
Posted : 14/01/2026 12:37 pm
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Those are southern hemisphere toilet rolls obviously. 


 
Posted : 14/01/2026 1:22 pm
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Ooh hang on i do have one.

Chas & Dave can be heard on My Name Is.


 
Posted : 14/01/2026 1:38 pm
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Joe Cocker has passed away 


 
Posted : 14/01/2026 3:13 pm
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Lewis Carroll invented the word "Chortle".


 
Posted : 14/01/2026 3:41 pm
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J.M. Barrie invented the name Wendy when writing Peter Pan.


 
Posted : 14/01/2026 4:21 pm
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Those are southern hemisphere toilet rolls obviously.

Saab Viggens. Obviously a Cold War Nordic aircraft themed toilet roll.


 
Posted : 14/01/2026 4:32 pm
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Posted by: joshvegas

Ooh hang on i do have one.

Chas & Dave can be heard on My Name Is.

Ooh, and only 14 hours late! 😉

 


 
Posted : 14/01/2026 5:08 pm
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I was listening to that the other day…

https://open.spotify.com/track/20VuO95A8RxUPlShnfYArW?si=UxnuAvoHRqy3Pc_sWN2zqg


 
Posted : 14/01/2026 5:25 pm