Connection to padstone.

Question

Posted by Tofighabout 4 years ago

I have a column base plate which sits over a padstone on the internal leaf of a cavity wall. Would you please advise what the best fixing for the hold-down anchors is.

baseplate,Padstone,pad stone,hold down

1 Reply

Posted by Ask HILTI Teamabout 4 years ago

Thank you for your enquiry. We have no data available for the application and generally we would not recommend a fixing installed in that position in line with the standard as the masonry units should be fully restrained. We do appreciate however that installations do occur into top layers of the masonry and our suggestion would be to increase the embedment depth down through a number of courses to provide a suitable level of resistance. Typically, this would be via an injection resin system such as the HY270 mortar. As mentioned, there is no data available therefore you will need to test on site to establish the allowable resistances.

3 comments on this reply

Posted by Ask HILTI Teamabout 4 years ago

Hello, the HY270 is specifically formulated for masonry and blockwork and has been tested in the largest range of base materials of any of our anchors. The HY170 is a universal resin that can be utilised in concrete and also some limited data for masonry. In relation to the M16 diameter 50mm is minimum edge distance to achieve 'a load' and is by no means the full capacity of the anchor.

Posted by Tofighabout 4 years ago

Thank you very much, what is the difference between HY170 and HY270? Can I use M16 in a 100mm wide but 215mm deep concrete padstone? It gives a 50mm edge distance and about 215mm embedment depth. Thank you.

Posted by Ask HILTI Teamabout 4 years ago

Thanks for the follow up enquiry if you are trying to anchor in the padstone only then yes the 50mm edge with restrict the diameter of the fixing to M8 or M10 . I'd also look at the HY170 rather than the HY270 if that is the situation.