How thick is traditional render

[bluebaron]

hi all,

Quick question had a quote for 100m2 of cement smooth render to external blockwork and the chap states 5mm scratch coat 5mm float (10mm total thickness) which seems a bit thin to me?

It's all new block work does this sound right?

By the way quote is £5300 inc vat for south east. Scaffold is up and it's ready to go three sides and a gable 2 storey.

 

[Doggit]

Find someone else. 5mm for a scratch coat doesn't allow much of a scracth, it's doable, but a bit minimalist. They're charnging about £40 per sqm which is a little on the high side considering the scaffoldings already up.

 

[bluebaron]

Ok I'll have a look around.


£5300/100m2 is £53pm2 unless you discounted materials?

 

[Doggit]

And the VAT

 

[Nige F]

It's included

 

[bluebaron]

Second quote came in today, this time for Krend, £9500!

Don't understand why everything I read on the net and via forums points me to £35pm2 for cement and £50pm2 for Krend but my quotes come is almost double those rates?

 

[Doggit]

Tell them you've had a lower quote, but you like them, and is there room for negotiation. Otherwise keep looking. £9500 should have got you external wall insulation. Just where in Sussex are you.

How were you going to finish off the render, as Krend is a finished product

 

[bluebaron]

I'm near Gatwick, I was just going to paint it if cement but was waying up cost difference to save the painting but £4K for a paint job took it over the top.

I'll call the guy back, he seemed fine and I'm confident he'll do a good job but was hoping to pay around £3-4K for cement and £4-5 for Krend. Asking him to half his quote seems a bit of a cheak but worth a shot I suppose.

 

[Nige F]

Don't understand why everything I read on the net and via forums points me to £35pm2 for cement and £50pm2 for Krend but my quotes come is almost double those rates?

One word causes that - Gatwick. I'll ask my plasterer what he reckons - That's Eastbourne prices. Can't see anyone halving a price - maybe a bit of leeway on an Estimate, but you don't estimate for a job like that.

 

[Doggit]

Keep looking for other quotes. If you tell them some guy looked at the job, thought you were a mug, and quoted you over 5K, they'll know where they've got to pitch it. The Krend is always going to be more expensive because it's more specialised, but it would be a nicer finish, plus there would be less maintenance.

 

[Malc]

http://www.thomasarmstrong.co.uk/di...l-guidance-sustainability/external-rendering/

recommends only traditional render which I'm told is because krend fails sometimes and they don't know why. Also, krend etc. will eventually look dirty and mouldy. You can clean it with algaecide but you can't paint it (and with cost of algaecide painting must cheaper). You can't invisibly patch krend either so what happens if you want to change a window (if those are rendered in) or need to do a repair. You also can't change the colour which might be important to the "boss" aka SWMBO . All things to consider.

BTW I assume thomas armstrong is a scottish company since they say

"Rendering must no bridge the dpc". .

 

[Doggit]

You can paint K-rend with a silicone paint, but they aren't cheap, and the colours are limited. I had an interesting chat with the Leyland paints technical department (who didn't know much) but got passed on to the paint/colour department (who really did now what they were doing) and it seems as the not all the silicone colours are colour fast.

Ceresit do a wide range of silicone paints, but I don't know much about their quality yet.

As to Krend failing; does it have a reinforcing mesh in it to help handle movement. I've looked at Webber, and I've done a Ceresit render job, and I'm damned impressed with the stuff, but it does have it's caveats. You can't repair a patch, you've got to do a complete wall so you ideally want a break collar halfway up the house. And the silicone surface being a rougher texture than Krend holds dirt, but then washes off dead easy when it's cleaned.