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Sounds like not enough epoxy in the holes. Powers recommends filling holes to ~2/3s depth (they are one of the typical makers). The epoxy must come out the top, or you are not getting the full embedment. also, you should normally be able to slightly twist the bar to get it to the embeddment...

"82 % OF 23.0 P.S.F. G.S.L. PLUS 2.1 P.S.F. RAIN LOAD) EQUALS 20.9 P.S.F. SPECIFIED ROOF LIVE LOAD" So if the ground snow load is 23.0 psf (that is the thing to check) the reduction is probably due to the slope. Snow loads on sloped roofs are typically reduced in comparison to flat roofs. At...

Not sure about availability in canada, but Prosoco has a line of consolidators/ densfiiers: http://www.prosoco.com/consolideck/#link3

For above-grade CMU walls there are elastomeric coatings that will work. But not over paint. You would need to blast off the paint, apply a block filler, end then apply the elastomeric coating.

Seems like it would be hard to give you a solution when you haven't figured out what the problem is yet... Fluids from a car? Algae or bacteria (seen red and orange in marble and some other stones on buildings/ monuments)? Someone spill something and not own up to it? If it's coming from...

My hat is off to you. Waaaaaay more advanced then the analysis programs we had to write in the mid-1980s. Back then the only real anaysis software (STRUDL) ran on mainframes. PCs were still pretty new, and the programs we were tasked to write were in Basic and Fortran, and did little more...

x2. Lots of misinformation in this thread.

We spec these types of anchots a lot, and I've seen tens of thousands of these that have been installed. It is rare for me to go on a project where they were used and seeing more than one or two like this out of hundreds. That holds true for Rawl/ Powers and Red head. If this is happening to...

For a slab with integral 'footings' I would be start with what would be known as a VDOT Class A4 General concrete mix. That is 4,000 psi, #56 or #57 aggregate, a maximum w/c ratio if 0.45, a slump of 2-4 inches and an air content of 6-1/2%. That is a starting point for discussion with a mix...

You really don't want to install the poists on columns, it's best to thicken the slab. But check the lift installation guidelines; depending on the base plate design you may be fine with a typical 4 inch thick wire-reinforced slab. If you need more then that the lift installation instructions...

Sorry -- did not see swharris's post or DieselDan's posts until just now. Mix/ sliump for a footing is not really the same as what you want for the slab. Higher slump isn't necessarily bad if you acheive it with admixtures that do not send the w/c ratio through the roof. Usually the concrete...

Without having membership access to Astm or ACi it's tough to get great info. but here is a brief overall description: http://www.forconstructionpros.com/article/12099992/what-are-ff-and-fl-numbers Note that getting beyond "Flat" means hiring a concrete contractor with proven results in...

Good list you have developed. It's always better to work up the requirements yourself so everyone bids what you want. Looks like you kept the 5 inch slump, which is a pretty loose mix. A couple things: 1. you ask for "final water and mix reports", but what will you do with them? you do not...

I would go with colored concrete but not stamped. And if you want the color to be even, go with concrete that has the coloring in the mix. If you like a more mottled look then go with stain afterward. For you application I think the more rustic-looking stain would look the best, although it...

Based on age it may have been torched on. The guy may have said "Rubberoid", which was the brand name of one torch-on mod bit membrane. Self-adhering mod bit sheets are relatively new, so I would be surprised if that is what is on the porch. Hard to tell without pics, though. Likely can...

Here's an example on a built-up roof:

A gooseneck like that is pretty close to what SMACNA and NRCA recommend. It's best to put in a real curb (treated wood is fine) and flash that with mod bit base flashing. then you fabricate/ install essentailly a sheet metal gooseneck that you route the service lines through. While I have...

Mine arrived today as well.

perlite has a pretty low r-value (~2.8 per inch)

We pay ~$20k/ year for our Errors and Omissions insurance. We also carry general liability, etc. And we have professional society memberships, health insurance, rent, office equipment costs, vehicle costs, etc. etc. etc. Similar to an auto mechanic, the hourly rate we charge for any given level...