That sounds like the winner Trev
From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On Behalf Of Trevor Grigson
Sent: March-23-12 7:55 AM
To: papercreters@yahoogroups.com
Subject: RE: [papercreters] Attaching things to papercrete walls
That's a pretty big shelf! If it were me I'd drill some deep holes into the wall and use threaded rod grouted into place. So use maybe ¼" rod in a 3/8" hole or 5/16" rod in a 1/2"hole say 6 or 8" deep for the top bolt on the bracket. The bottom bolt could be say 4" deep since it's under compression not tension. Make up a sloppy grout of cement mixed with watered down cement conditioner (not sure what they call it in the states, but we have a product called Bondcrete, it's a waterproof PVA product, grout plastisizer for tiling would work too) Inject that in the hole then put the threaded rod (with a point ground on it) in the chuck of your cordless drill and slowly drill it into the grout. Not too fast so you drill the grout out. Leave it to dry a bit till the grout is stiffish then bolt on your brackets and shelf so it dries in the right alignment. Only hard bit is getting the grout into the hole. You need a syringe of some kind, or sloppy grout with a hose and funnel.
Trev
From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On Behalf Of Tom Hay
Sent: Friday, 23 March 2012 2:32 PM
To: papercreters@yahoogroups.com
Subject: Re: [papercreters] Attaching things to papercrete walls
My guess is that there will be a problem holding a lot of shelf weight. The typical wing anchor and the newer brass colored curved wire picture hangers are designed for use with drywall. The back face of the drywall carries the weight. The small plastic anchors work in drywall, plaster, concrete, wood, etc, but require a fairly dense material for the plastic to lock into when the screw causes it to expand outward. My suggestion is the kind of anchor used with vinyl covered wire shelves. It is a fairly big anchor with a metal ring on the face. . The threaded bolt screws into another metal piece at the rear of the anchor. As you screw it in and the rear metal piece is pulled forward, the plastic piece in the middle expands significantly more than the plain plastic anchors.
If that doesn't work, you may have to find a way to anchor into something behind the papercrete, if you can. Good luck.
Tom Hay, Ph.D.
A2B Research and Development, LLC
703/447-1616 (cell phone)
703/672-6033 (internet phone)
tomhay@verizon.net
On 03/22/12, JUDITH WILLIAMS<williams_judith@hotmail.com> wrote:
I did really well in getting the cement in my mix down to 1/2 bag per 200 gallon mix. Now that I am ready to hang a shelf I am worried it might be too heavy for the wall. The screws may pull out. I have been thinking of all sorts of different ways to make sure the shelf doesn't fall down. I even looked at some of those fancy fasteners but don't know what to buy. There are some that have a plastic part the goes into the hole first and some that have little wing thingies that stick out if you put them into drywall. I also thought I would glue a decorative piece of punched tin to the wall behind where the brackets will go. I just don't know, but I want that shelf up there soon. It's a 2x12 12 feet long to span an entire wall. I have 4 beautiful cast iron brackets to hold it up.
Follow progress on the new project at http://www.papercretebyjudith.com/blog
More papercrete info at http://squidoo.com/papercretebyjudith
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