full house blown after 3 months, wtf?

[funnyfanny]

I rendered a house in November, before any cold spell and the whole lot has blown. I can't understand it at all. The only thing I can think of is that it was painted too soon locking in moisture that has frozen recently. Anyone any ideas?

 

[JamieMac]

its cos ur a funny fanny.but not 2 worry av got an idea.re render.

 

[funnyfanny]

Why even bother posting? Silly boy

 

[JamieMac]

cos a cant resist a punany

 

[funnyfanny]

Side splitting stuff mate, you're funny. But on a serious note go forth and multiply, and buy your self a dictionary whilst you're at it.

 

[JamieMac]

ok am running 2 the shop with my hair blowing back in the wind.and sparks coming of my heels.

 

[warriorupnorth]

I rendered a house in November, before any cold spell and the whole lot has blown. I can't understand it at all. The only thing I can think of is that it was painted too soon locking in moisture that has frozen recently. Anyone any ideas?

Could be a multitude of reasons mate, have you any pics, but at the end of the day it has to be re done, so make sure you get the customer on side and do as much as you can to placate them till your able to re-render it.

 

[funnyfanny]

The customer's fine about it, they was rushing to get it painted before the weather turned so it was painted within a week of it been rendered. prior to rendering the house had no issues with damp, salt, etc so I'm just stumped apart from the paint issue.

 

[warriorupnorth]

The customer's fine about it, they was rushing to get it painted before the weather turned so it was painted within a week of it been rendered. prior to rendering the house had no issues with damp, salt, etc so I'm just stumped apart from the paint issue.

That may well be the problem then

 

[henry]

when you say it's blown do you mean back to brick or top coat blown. Not trying to tell you how to suck eggs but what mix did you use and were did you get your sand from.

 

[scotsplasterer]

Too strong a mix in my opinion that's why it repels, what ratios did you use, can't see painting it repelling it though, even if it's not cured

 

[DannyMac]

Was the top coat a weaker mix than the scratch?

 

[theblones]

did you prime the substrate with anything. IE rendaid, microgobetis. and did you wash the substrate down at all

 

[Rigsby]

I have seen render fail in the past because of painting it too soon. The paint was cheap stuff though with a lack of breath-ability. Also was it decent sand? Soft sand could fail. Is it just the top coat or back to brick? I did a job today, old facing brick so sbr then Plastering sand & cement modified with sbr. Put the sbr on and no suction what so ever. Took ages to stiffen up. I asked the client if he had treated the wall with water repellent and he said he had numerous times. No wonder there was no suction. Sbr it was then with the said mix but with glass fibre strands and fully meshed and pinned back with plastic washers and hilti nails all over. If this lot blows because the sbr has not stuck then hopefully the mesh pinned back will hold it in place. Only 1m deep so heres hoping.

 

[irish_spread]

Bet it was over breeze blocks

 

[Arti]

Could be a multitude of reasons mate, have you any pics, but at the end of the day it has to be re done, so make sure you get the customer on side and do as much as you can to placate them till your able to re-render it.

PLACATE. nice one warrior im sure funny fanny asked jamie mac to get the dictionary marra. but defo word of the day......:RpS_thumbsup:

 

[lilharbs]

if it wasnt dried it would probably do it or if it wasnt mist coated properly first then it hasnt got enough protection and water will get right in and pop the bloody lot.

 

[murplastering]

not enough info cant see the scratch being affected by paint, whats the construction etc

 

[flynnyman]

"Im sorry pal but the paint has made it fall off" LOL youve got some balls saying that to a customer hahahahaha

 

[funnyfanny]

It's an old house, bricks not block. The bricks were real smooth, used sbr, the same plastering sand I've used on countless other jobs. I can't say what's blown as he doesn'tI want anything pulling off until I can get there to sort it out for him. The paint was sandtex smooth which is good stuff by all accounts. I'm going to sort it out at a loss to me but it's just baffling. I've been doing it for over 20 years and not seen anything like it.

 

[DannyMac]

Did you slurry coat it or paint it with SBR? Were they engineering bricks?

 

[flynnyman]

well if he painted it after a week he must of dried it out quick this might be the problem.

 

[lilharbs]

ive seen it done with the same sandtex with no mist coat at all and it blew the lot off after snow 2yrs ago.fact.

 

[FreeD]

Sandtex is breathable isn't it? like Weathershield. Sounds like substrate wasn't prepped correctly.

 

[plasterjfe]

smooth brick ? wht type and sbr - did you prime the walls with sbr or mix it into a cement slurry ?

 

[Rigsby]

Just a thought? Did you use your usual waterproofer in the scratch coat.

I only use Feb Rendamix but I did a job in the late 80's for a builder what used Cementone waterproofer and that went to dust on the scratch coat. Also if the scratch was on sbr (slurry I presume) there would have been little suction. Did it dry fast. Faster than it could set?

 

[Render Systems]

sounds like you have gone over engineering bricks... they are as bad as glazed brick as there is literally no suction what so ever and the scratch coat although it will set has not got anything to hang onto... so when you top coated it the hydraulic preasure of the finish coat drying has pulled the scratch coat off in my opinion.. when you fix it grind the mortar beds out and cover walls with microgobitis or unigrund to key it all then put 5 x 1 scratch and 6 x 1 top coat...