Originally Posted by lmc
Hi, i the owner of a new construction home and want to paint my own house it has hardiplank lap siding i was told by my builder not to caulk under the lap but i talked to a painter and said it is common practice to do so i would appriciate any help ya'll can give. Thanks
They are actually both telling you the truth. It is very common to see this seam caulked, but it should not be, because of moisture as stated by others.
We use a product called "Siloflex" to caulk both cement siding and PVC trim materials. We get it from the local vinyl siding/window distributor, as it is used for installation of vinyl replacement windows. It works very nicely and is paintable once cured.