Questions tagged [mortar]

Mortar is used between bricks, cinder blocks, or stone to bind them and fill any gaps. It is made from sand, a binding agent (cement or lime), and water.

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Crack isolation mortar - gimmick or real deal?

I saw that the FlexBond FBW50 at Home Depot says it "Isolates cracks to 1/16 in" - does that mean that if a crack forms after installation, it somehow keeps this from affecting the tile? If ...
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3 answers
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Which thinset mortar do I choose

I have painted redgard on the shower walls and I am ready to tile. Which thinset mortar do I use over the redgard? I am using 12x24 tiles on 1 wall and 4x12 on the other 2. I am using ceramic tiles.
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Repairing minor cracks between brick wall and exterior stairs

How do you recommend to repair minor gap between exterior stair and clay hollow brick wall - the wall has plaster and paint on it. Do I just patch with gypsum and water or mix cement with water and ...
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1 answer
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How can I fill the empty space behind a bug screen installed on these stone arches?

I want to install bug screens in the open stone arches of my sunroom. I have flexible screen retainers ready to replace the wood that the previous owner roughly installed for the same purpose. The ...
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1 answer
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What should I use to repair this small crack between window and stone? Is this caulk?

I’m a new homeowner and just noticed this small opening next to my upstairs window between stone and window. Is this caulk that’s used there or mortar? Any recommendations on how I should go about ...
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how to repair a concrete patio slab with crumbling edges

A brick-on-sand patio was added to the house back in the 1970s atop a poured concrete foundation that goes down 36", below frost-depth, per local code. A brick-veneer was adhered with mortar to ...
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What type of mortar for foundation blockwork below ground level?

I'm building a shed / outbuilding on some ground that is prone to water logging. I already have several concrete pads on top of which some aggregate concrete blocks will be placed to raise the ring ...
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1 answer
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Use mortar between OSB and old concrete subfloor, in shower?

Replacing a shower pan in a 32x32 alcove. The prior acrylic base was bedded in mortar on top of concrete subfloor. The new pan I intend to buy has an OSB and foam underside, seemingly meant for a flat ...
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What are some uses for an old Quikrete?

I have a leftover bag of Quikrete that has turned into solid rock. It was stored for several years in a damp garage. Lesson learned. I am thinking of using it as a step base on my new shed outside. ...
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Thinset too dry before laying tile? Not dry enough?

Yesterday I laid 6x36 wood-look porcelain tile in my bedroom using a mapei ultraflex LFT thinset directly to the concrete slab. It's been 24 hours, and I am now pulling off the top tab of the spacers ...
2 votes
2 answers
275 views

Do these cracks in a brick wall indicate foundation movement?

This is the back wall of my detached single garage. It's just single skin, built in the 60s and as I want to use this building as a workshop, I'm looking to spend a bit of money getting it properly ...
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Is this sand or motar?

Originally I was going to repair the joints on my 20 yo brick stairs (pic A) As I was chipping away the broken joints I noticed a few of the joints had the consistency of wet beach sand and I could ...
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How do I self-repair a section of crumbling basement wall, or should I hire a professional?

How do I self-repair a section of crumbling basement wall, or should I hire a professional? Background: How I discovered it: I removed some exposed blue foam insulation from my basement walls to ...
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-1 votes
1 answer
238 views

O or N Mortar for Fieldstone foundation on the exterior side

My house was built in 1860 and I have a field stone foundation. I have some areas on the exterior that I need to reapply some mortar on. I know some people are using type N and adding sand and some ...
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276 views

Outdoor kitchen on sloped patio

I am building an outdoor kitchen using standard 8"x8"x16" concrete blocks on a concrete patio which slopes away from the house. The length of kitchen is 120" and the slope of the ...
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3 answers
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Will a slab poured with mortar stand up to service under a pizza oven?

I mistakenly did not add any stones to my foundation mix and now have a mortar foundation. It is 1.6m x 1.6m x 0.2m with reinforced mesh. I am creating a brick pizza oven with hollow concrete blocks ...
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1 answer
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Identifying material on masonry wall

The inner side of an exterior wall in my house has, behind the plasterboard, a kind of masonry which I'd like to identify. I attach pictures. It looks like concrete but it's quite easy to drill: I can ...
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What to do about daylight between brick and mortar?

I noticed a small space between this brick and the mortar underneath it on my front porch. It’s wide enough for me to fit a piece of old duct tape into the gap. I’m not sure when it was repointed last....
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Materials for rock wall repair

I have a rock retaining wall that has seen better days. Some day we may replace it, but for now, I would rather try to do some patching to make it more water right and also to fasten the top stones ...
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How to replace mortar above lintel

We have a brick house and our windows have an iron lintel above them, with a layer of mortar on top of the lintel and bricks on top of the mortar. For one window, it looks like water got under the ...
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1 answer
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Should I be concerned with a minute amount of flexing under a shower tray?

I have recently installed a quadrant shower tray. The manufacturer recommends a 5:1 sand and cement base on an 18mm structural marine ply to support the tray. The tray was set on a 18mm sand and ...
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2 answers
1k views

Which thinset to connect USG Durock® Brand Cement Board with EdgeGuard?

I am about to install USG Durock® Brand Cement Board with EdgeGuard onto my bathroom frame where the toilet is (I'm using HardieBacker for the shower FYI). This is new construction. According to USG's ...
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10 answers
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Rusted screws in outdoor outlet box

Summarize the problem I need help removing rusted screws from an outdoor outlet box. A few notes: The outlet box was used for an outdoor light that I removed I turned off the breaker I have access to ...
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1 answer
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1920 UK London House - How should I internal insulate?

The house was built in the 1920's east of London. The inside walls are cold to touch and we are considering insulating them. The house was recently externally rendered without external insulation :( ...
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3 answers
889 views

Cement vs. mortar for embedding stones in drive way

I will be scraping a dirt/gravel driveway down two inches and laying flat stones of various sizes and thicknesses. Need to have the tops at the same level, so some will need to have something ...
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Will a cement mixer extend the working life of mortar?

I'm going to do some brickwork on my own. Last time it was quite the job to mix up mortar and get it laid before it started to go off (I know, working in pairs would be helpful!). I know I can ...
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Fireplace mortar cracks

I have a large crack where the fireplace hearth meets the chimney. I’m curious if this is a foundational problem, and if it needs to be repaired by a pro, or if I should just use a sealant repair ...
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1 answer
817 views

Can I use Type-S mortar and rock to set wood fence posts?

I am trying to set a fence post by the house to fix up a gate door. The usual "bag mix" for this job is a mixture of quarter inch stone and cement and lime. However, I also have a bag of ...
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I am re- pointing between patio slabs using soft sand and a standard cement.The cement recommends 1 : 5 but should it be 1:3 for these slabs? I

I am re- pointing between patio slabs using soft sand and a standard cement.The cement recommends ratio of 1:5,but should this be 1:3 for patio slabs?
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Lime mortar for indoor applications

I have a question. Can I use lime mortar (hydrated lime and sand mix) for indoor applications? I have to re-point an old, brick wall (This is my first time doing it). Is it safe health-wise? What else ...
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3 answers
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Brick to drywall

My home was built in 1971. There is a brick fireplace that runs up the entire wall. The mortar is cracking and breaking in chunks(about 1" thickness) where the fireplace attaches to the wall. I ...
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How to prepare vertical brick surface so Portland cement based mixtures (concrete, mortar) will adhere properly?

I have a sub grade vertical stack of perforated brick (foundation) which I need to coat in a thick layer of mortar or concrete in order to fill gaps, creating a flat surface for subsequent painting/...
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Holes in brick mortar?

There are a couple holes in my house's exterior brick mortar about 3/8" in diameter. Is there any reason not to fill them in? I only hesitate because my masonry knowledge is pretty much nil. ...
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Best way to fix tile

One of our old tiles suddenly feel off, the others seem ok. What's the best to fix back. I don't think I'll be able to get a new tile to match, and I don't think I can chisel the old mortar off ...
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Do I have a fieldstone foundation and if so, do I need to use Type O mortar?

I own a house that was built in 1890. The area of my foundation that I need to work on is an exterior section that is above ground. It is the part between my driveway and where the siding starts. I ...
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2 answers
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How long should I wait to drill holes into brand new mortar?

I just repaired loose bricks on my house in preparation to install new window shutters. When would it be ok to drill holes into the mortar and install the shutters? From my other research I'm going to ...
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Pouring concrete over rocks

Need a bit of guidance here, I have tough yard and my contractors are going to pour concrete over some large boulders and filled in the remaining area with parts of other boulders (6in to 1 foot). ...
1 vote
3 answers
3k views

what is the correct procedure to patch up cinder block hole with plumbing?

(followup question to Why is this Ptrap installed in this location?) Here is the hole that I want to patch up: As you can see, it is a cinder block wall with concrete foundation with a new PVC drain ...
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1 answer
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How to maintain an old brick wall

we have a small section of exposed brick from an old chimney in the kitchen. The chimney is now used as an exhaust for the furnaces in the basement (and maybe for the kitchen exhaust in a different ...
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Is there anyway to prevent rust stains or staining of color on a house that has been German schmeared? (Thinset mortar applied to brick)

We applied thinset white mortar on the brick of our house using the German schmear technique. After a very very hard rain, we had some rust stains show up down the brick in areas around older gutter ...
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Retile Shower Floor Only?

I want to replace my mosaic tile shower floor. The shower pan is hot mopped. The wall tiles are set on a 3/4 inch mortar bed. I imagine replacing the floor tile means replacing the hot mop, which ...
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Is this joint between the foundation and first row of mortar typical

Just wondering if this is a normal appearance for the area where the foundation and first row of mortar/brick meet. There are no signs of any structural cracks or anything like that in the area. Is ...
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1 answer
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What should I use to patch this gap between brick siding and top of foundation

I have a small gap between the top of our foundation and the start of the brick siding in one isolated area and was wondering what the best material would be to fill this area.
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1 answer
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Shower base and perimeter adhesive & grout

Just put in the shower floor tile with epoxy adhesive & have the perimeter tiles left to do (the very bottom tile against the shower floor tiles) What Adhesive can I use for this? Is it ok to use ...
2 votes
1 answer
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Filling gaps between bricks in pool deck

I am repairing the deck around my pool. Some bricks were loose, so I removed them, ground off old mortar and glued them back. Now I need to fill the gaps between the bricks with mortar, similar to how ...
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Temporary Re pointing of Brick work

I have some damp in a bedroom which is because the wall outside needs re-pointing. I will do this in the summer but what can I do as a temporary fix
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What adhesive to use when tiling the fireplace hearth?

I am tiling the wood burning fireplace hearth and it gets really hot especially in the top-middle. I am wondering what kind of adhesive should I use for this purpose? I don’t want it fail due to high ...
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placing a tile on an old plank floor

The subfloor in my home is 4" planks. The previous owner removed the hardwood, painted the flooring and left it that way (I have no idea why you would do that). Regardless I want to put down tile. ...
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Repairing above-ground gaps and holes in foundation

I am moving into a house (built 1911) that had a few things turn up on the inspection. One corner of the basement has an indoor cistern, and there are some gaps and a hole in the cinder blocks just ...
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What type of mortar should be used for small mortar repair on a 100 year old house?

I've read that one should use a special type of mortar with old brick houses because they expand more - portland mortar vs soft lime. The recommendation from the NY Landmarks Commission states: ...