Screwing hardi backer

[widler]

Doing the job right starts from using the proper materials for the job in hand. Not only are the drywall screws not spec for the job the are incredibly alkaline sensitive so not only do you have to worry about there strength they have other issues

Im curious what issues a alkaline sensitive screw wiuld have , please explain andy

 

[Time's Ran Out]

Me too, me too!

 

[Qwerty]

Galvanization–passivation–synthetic coating
A) Zinc yellow passivated

B) Zinc-plated, transparent passivated (generally termed "bright galvanised, zinc-plated")

1. The application of a zinc layer protects the material of the screw from corrosion and simultaneously gives it a greyish, silver-coloured appearance.

2. The application of a passivation layer to the zinc-plated surface of a screw results (depending on the chemical process used) in a yellowish or transparent coloration of the metal. The passivation of the zinc layer improves the corrosion protection.

3. After the zinc coating and passivating processes, the screws are given a further synthetic coating, which reduces the screwing-in torque required, making the screws easier to use. SPAX with zinc-plated surfaces are for indoor use. They should not be used outdoors or in damp locations.

 

[Qwerty]

This is from SPAX ^^^

 

[AndY mac]

The phosphate coating on drywall screws in my option is not enough for a coating of tile adhesive. Once screwed in and surface scarred they corrode real quick. Only seen proof of this once. Doing a job with my uncle a bathroom floor with a marble tile spots and discoloration on surface. Once we lifted ply had been screwed down with drywall screws rusted out.

 

[widler]

Personally , i think most screws will rust , apart from stainless, in certain environments.
But i get your drift .
Unfortunatly Ive used drywall on outside render jobs screwing beads on for years , with no rust spots ect

 

[Bathfix Bob]

Kyle you really got be thinking with this, recently I bought myself a Bosch 10,8 driwall gun and its totally speeded up be driwalling so I thought why not give it a go with those Senso screws in your link so I bought some. I've used them today but with them being 4.2 gauge the little Bosch cant sink the screwheads so I have to go round with a combi drill. This is still quicker but it would be nice to do it in one go, is it possible to get 3.5 collated woodscrews? If not I will need to get a beefier gun, does the Hilti sink the heads?

 

[Kyle Knowles]

I'm not sure about if u can get 3.5 collated screws but to answer the other question yeah mine drives the screws straight through the hardi and out the back if u have the depth set wrong it's a beast somehow it's more powerful then my impact driver

 

[Bathfix Bob]

I debated for ages about which screwgun to get, I already have Bosch 10.8 stuff and makita 18v.

The makita screwgun had endless people saying it kept jamming which put me off so to save buying into another battery system I got the Bosch 10.8 driwall gun, its just about powerful enough for 3.5 driwall screws but struggles with the 4.2.

I'm thinking now about getting a 240v Bosch drywall gun and using the same collated attachment.

 

[Kyle Knowles]

I debated for ages about which screwgun to get, I already have Bosch 10.8 stuff and makita 18v.

The makita screwgun had endless people saying it kept jamming which put me off so to save buying into another battery system I got the Bosch 10.8 driwall gun, its just about powerful enough for 3.5 driwall screws but struggles with the 4.2.

I'm thinking now about getting a 240v Bosch drywall gun and using the same collated attachment.

I have the bosch 10.8v impact and drill set which is a great little set for day to day use but when it came to drywall guns I joined the plasterers forum and after reading loads of threads everyone with a hilti said they wouldn't go back to senco makita dewalt or bosch so I bought a hilti one and it's never missed a beat

 

[PaulSmith]

What about the Reisser screws. Just ordered a load.

 

[Kyle Knowles]

I like the Reisser screws they provide u with a bit for them that never slips out

 

[Kyle Knowles]

I use my dry wall gun for all screwin job other then insulation board coz of the washers