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19 replies
13k views
19 replies
Attaching posts with Big Dog screws to fence?
Also test Essve's WAF screw which is also somewhat similar. It would be interesting to know the results!H Harald Blåtumme said:I can add that I ran out of my Big Dog 8x120 mm, found screws that looked identical at Byggmax except they were a little shinier in the coating and a bit rougher in the finish on the metal. The price per screw was about the same, here it was another brand "InFe". I will do a thorough torture test similar to the one I've already done on the original "Big Dog" from the manufacturer FAST, interesting if the copy can also handle really strong moments or if it just breaks apart when it gets tougher, I'll get back with the results like tomorrow.
Now 2/3 of my fence has been put up and I am satisfied so far. Went to one of our larger hardware stores and asked for someone who knew about screws. They don't have Big dog but recommended ESSVE WAF, which I had no problem with. However, he recommended a too small dimension 8.0 x 50....One on each side, the post wobbled like rhubarb. Just had to go and buy carriage bolts, now it sits like stone. The cost doesn't differ much more so I will continue with bolts for the rest of the posts.
Haven't had the time to torture test Big Dog vs Byggmax "Infe" yet, but it's coming soon. The last workweek before vacation is almost over... nice.
50 mm screw length is quite small for thick posts, of which maybe 4mm goes into the post shoe, making it a rather weak connection.
Through-bolt connections like carriage bolts are definitely an option I consider if I have fittings that allow for this without needing to drill new holes in the metal, especially good if there is a good fit between the post shoe and the post so it can tighten properly. You might have to try out what works, and as mentioned, definitely not opposed to good old large French-style connections where it feels right.
50 mm screw length is quite small for thick posts, of which maybe 4mm goes into the post shoe, making it a rather weak connection.
Through-bolt connections like carriage bolts are definitely an option I consider if I have fittings that allow for this without needing to drill new holes in the metal, especially good if there is a good fit between the post shoe and the post so it can tighten properly. You might have to try out what works, and as mentioned, definitely not opposed to good old large French-style connections where it feels right.
Drive for three more weeks before vacation and have said that the fence with the gate should be finished by then. The gate is left, so the fittings should be procured before the final stage begins. It should take half a day to make it look nice and precise so that it fits well when opening/closing the gate.
Planning to build a tall fence myself, 1800 mm, and considering the attachment method. I have cast my own footings and placed two steel anchors in each, dimension 500x40x8 anchor steel. 95x95 posts. I considered wood screws (French/ESSVE/Big dog) but after reading here I will probably choose bolts with nuts for more stability, plus it's easier to "re-tighten" once the wood dries after a year.
So it will be 95+8+8 = 111 mm + washers. 120 mm long bolts M12 should suffice (the holes in the anchor steel are 13 mm). But I'm afraid drilling will make it difficult to align correctly between the holes. At the same time, it doesn't really matter if the hole in the wooden post ends up too large since the bolts clamp the anchor steel together, so it should hold the posts in place regardless.
A question, are hot-dip galvanized/galvanized bolts/screws sufficient? (the anchor steel is hot-dip galvanized/galvanized) or should I pay four times as much for A4?
So it will be 95+8+8 = 111 mm + washers. 120 mm long bolts M12 should suffice (the holes in the anchor steel are 13 mm). But I'm afraid drilling will make it difficult to align correctly between the holes. At the same time, it doesn't really matter if the hole in the wooden post ends up too large since the bolts clamp the anchor steel together, so it should hold the posts in place regardless.
A question, are hot-dip galvanized/galvanized bolts/screws sufficient? (the anchor steel is hot-dip galvanized/galvanized) or should I pay four times as much for A4?
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