What do I use to fill this gap

Old 07-01-14, 09:27 AM
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Question What do I use to fill this gap

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Just curious how I go about filling these gaps. Huge noob when it comes to home DIY projects, so more details are awesome.

Thank you
Old 07-01-14, 10:19 AM
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Is that mortar or some type of caulk in the joint already? If it's mortar you can fill the gap with more mortar.
Old 07-01-14, 11:23 AM
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Placing a temporary form across the bottom of the opening will enable you to dry-pack mortar in from the front and top, without loose mortar falling out at the bottom. Slightly moisten the bonding surfaces (existing mortar and concrete/stone) and then let them almost-dry before packing the mortar in. Don't mix it too wet, or it won't have enough strength and durability. I'd use a narrow margin trowel or narrow putty knife to firmly push the mortar into the opening. Don't overwork it, but let it slightly set before giving the exposed surfaces a "smooth-over" with a moist paint brush.

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