Stainless Steel v's Galvanised

[Greenie9657]

Hi All

Im currently building a porch, well im now ready to starting bringing the walls up once i have ordered everything this aft. Anyway, I was about to purchase the wall ties and stumbled across 2 types. So my question is which ones should i get. Stainless steel or galvanised wall ties? theres only about £2 difference so i was going to go safe with the Stainless but your thoughts are welcome.

Many thanks

 

[freddiemercurystwin]

Stainless if you're near the coast otherwise galv.

 

[pred]

I thought galvanized wall ties have been illegal for 10yrs or more.

When I did my kitchen extension circa 10yrs ago, I let my spread talk me into having galvanized bellcast, the rust has been coming through the Dulux masonry paint for the last 3/4yrs, I will never use galvanized bellcast, wall ties or corner beads externally again.

 

[pred]

Look at the price of S.S. wall ties, I hardly think they will break the bank, then look at the price of the remedial wall ties not forgetting the cost to install them, it's a no-brainer.


https://www.google.co.uk/#q=cavity+...78,d.d2k&fp=6cb733427523ec89&biw=1266&bih=881

 

[freddiemercurystwin]

If the galvanised ties are adequate ie the galvanising is heavy duty they will be fine. The vast majority of wall tie replacement has/does occurs because mild steel or poor quality galv ties were used.

 

[^woody^]

Galvanized ties will last the life of the porch.

Houses built with galvanized butterfly ties from the 50's onwards are not all falling down

 

[pred]

I'm sorry but as the poster says for the difference of £2.

The main cause of wall ties rusting through is when you hit them with your trowel while putting the bed on the second wall.

If you want to argue the point feel free to come to my house and take it up with Mrs Pred, if the bellcast gets any worst I'm going to chisel it out, replace it with S.S. and rerender the wall.

 

[tony1851]

Houses built with galvanized butterfly ties from the 50's onwards are not all falling down

That's partly a function of the type of mortar used. Where I am, all the mortar used pre-War was black-ash lime mortar, and it plays havoc with the galvanising. After the War, I think they stopped using that stuff and went over to cement.

 

[^woody^]

No one uses black ash mortar now or any high chlorine or sulphate content mortar, so there are no issues of corrosion

Pred, belcasts and external beads are totally different exposure and vulnerability to wall ties, so not really relevent

Ask yourselves this ... why are standard lintels not made of stainless steel instead of galvanized?

 

[pred]

But for the sake of £2 its got to be a no brainer surely.

 

[Nige F]

I thought galv was outlawed too Thing is , if it`s OK what`s to say they aren`t galranised from our Far Eastern Friends

 

[tony1851]

Galvanising is not the panacea for all water-ingress problems. Galvanised lintels, for example, also have to be protected by a damp-proof membrane.

 

[^woody^]

Catnic lintels don't.

And the cavity tray is not there to protect the lintel, it's a bit bizarre for you to suggest that Tony

 

[tony1851]

Catnic lintels don't.

And the cavity tray is not there to protect the lintel, it's a bit bizarre for you to suggest that Tony

Sure, the two-part coating process of Catnic acts as a cavity tray.

But galvanized steel is susceptible to rusting - I've got such a lintel over my garage door which is slowly rusting.

(see this below from a lintel manufacturer).

http://keystonelintels.com/cpd/riba/slide56.htm

Examination of 30 to 40 year old lintels in situ showed that corrosion had only occurred on the outer leaf where mortar was in contact with the zinc coating. Lintels protected by a damp proof course (DPC) showed almost no corrosion. For zinc, pre or post-galvanised, alkaline or neutral conditions do not cause corrosion. Fresh mortar is alkaline and remains so for a number of years. The mortar slowly carbonates by absorbing carbon dioxide from the air. Eventually the mortar becomes acidic enough to allow some corrosion of the zinc to take place, as the carbonic acid in the mortar builds up.

 

[^woody^]

The issue is, if galvanised ties are bad and should not be used, then why are we still using galvanised lintels?