Mortar Bed Question - Tiling, ceramics, marble - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring > Tiling, ceramics, marble

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools
Display Modes
Old 04-20-2015, 12:43 PM   #1
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default

Mortar bed question


How much Portland cement and sand do I need to mix to complete a 48" x 31" shower pan with a 48" curb? I'm doing a Laticrete membrane so there won't a be preslope level (i.e. all the mortar will go in at once). The height of the mortar at the drain will be 1-1/4", and the curb will go in on 3 stacked 2x4s.

I just want to avoid running out before the job is done.
costgeek is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-20-2015, 04:01 PM   #2
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


You should use two different mixes, Sand Topping Mix for the floor and mortar mix for the curb. The mortar for the curb needs to contain lime which makes it sticky.

Your pan is 10.5 sq. ft. and I'll guess the average thickness will be about 1.6"

#60 = .50 cu. ft. = 6 sq. ft. @ 1" & 3 sq. ft. @ 2"
#80 = .66 cu. ft. = 7.8 sq. ft. @ 1" & -4 sq. ft. @2"

You will use about #200, so 2 @ 80 + 1 #60 or just get 3 #80. It's cheap. One bag of mortar will be plenty for the curb if you go that way.

Ever do this before?

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]

Last edited by JazMan; 04-20-2015 at 04:04 PM.
JazMan is offline   Reply With Quote
The Following User Says Thank You to JazMan For This Useful Post:
costgeek (04-21-2015)
Sponsored Links
Advertisement
 
Old 04-20-2015, 09:41 PM   #3
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


HUH? I wonder if the geek got this?

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-21-2015, 06:09 AM   #4
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default


I'm here Jaz. I was busy last night installing Durock (bathroom reno is my 2nd job).

My understanding was I needed 1 part portland cement, 1/2 – 1 part powdered masonry lime, and 4 parts sand for the curb. I also read that stucco base coat works well too. Ever use that?

Yes this is my first mortar pan. Doing home improvement at night is the only way I get out of doing dishes...
costgeek is offline   Reply With Quote
Old 04-21-2015, 10:12 AM   #5
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


There are many variations to the recipe of "fat-mud". People have their own preference and they work. Your recipe is fine, others like more sand and lime such as; 1:6 + 1 lime, even 7 sand. Yes, stucco base, (I think it's also called brown-coat) is very similar too.

I didn't realize you were gonna mix from bulk. What type of sand will you be using? Be sure to mix by volume, NOT weight. Sometimes the two are close, but many non pros make the mistake of weighing the ingredients. We don't use no stinkin scales on the job.

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
Old 04-21-2015, 10:20 AM   #6
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default


I didn't realize the sand topping was already the right ratio. So I can use these two, adding water only...right?
Attached Images
   
costgeek is offline   Reply With Quote
Old 04-21-2015, 10:44 AM   #7
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


Sand Topping is usually 1:3, It'll work fine as is, just harder to work with. We usually add some washed sand. Take a guess how much to add. For the shower floor, a 1:4 is the ideal mix, but 1:5 or even leaner will work fine too.

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
Old 04-21-2015, 07:45 PM   #8
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default


One last question Jaz: Does it matter if I put the curb in first?
costgeek is offline   Reply With Quote
Old 04-21-2015, 08:46 PM   #9
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


I would say yes it matters.

How you gonna work in the shower without damaging the curb? The curb is always last.

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
Old 04-24-2015, 01:42 PM   #10
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default


Ok Jaz...the pan is in. And just to clarify, I wasn't talking about putting the curb in before the pan on the same day...I knew I wouldn't have time to do both so I was considering which I wanted to do first.

Anyhoo, I just want to make sure I understand this whole modified vs unmodified thinset issue. So tell me if these statements are true:

1) I need to use unmodified thinset in the shower because I'm installing onto a topical membrane.
2) I need to install hardiebacker to the bathroom floor with modified thinset because it sticks better to plywood.
3) I can use either to attach floor tile to the hardiebacker, but modified is probably better.

I know you're going to miss me when this bathroom gets done...probably some time in October.
costgeek is offline   Reply With Quote
Old 04-24-2015, 02:01 PM   #11
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


Hi,

1. NO, well kinda. If you're still using Laticrete stuff, I think they say modified, but go check. I don't think you ever said how the walls were being waterproofed? But I didn't re-read this whole thing. If it was Kerdi, you'd wanna use unmodified for over wallboard or CBU. So, what are you going over and which membrane?

2. Yes & No. Hardie says you can use either. Technically you do not have to stick any CBU to the floor. The mortar holds the board up, and the screws/nails hold it down. But yes, modified bonds well to ply and OSB where unmodified does not.

3. No. Sure, even unmod will work, but Hardie wants you to use modified and why wouldn't you? It's better in most cases.

4. Oh, there is no #4.

Quote:
I know you're going to miss me when this bathroom gets done...probably some time in October.
You wait 'till you get my invoice!

I'm gonna be out your way soon for a visit. Maybe I'll hand deliver the invoice?.....

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]

Last edited by JazMan; 04-24-2015 at 02:03 PM.
JazMan is offline   Reply With Quote
Old 04-25-2015, 01:47 PM   #12
Member
 
Join Date: Dec 2014
Location: Northern Virginia
Posts: 207
Rewards Points: 374
Default


Hey no problem. My address is 1600 Pennsyvania Ave. Just let yourself in!
costgeek is offline   Reply With Quote
The Following 2 Users Say Thank You to costgeek For This Useful Post:
JazMan (04-26-2015), MTN REMODEL LLC (04-25-2015)
Old 04-26-2015, 12:31 PM   #13
Tileguy
 
JazMan's Avatar
 
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 6,026
Rewards Points: 754
Default


Quote:
Hey no problem. My address is 1600 Pennsyvania Ave. Just let yourself in!
Good One! But sorry, I'll try to visit in a couple years.

Jaz
__________________
TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
JazMan is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Tags
mortar bed , mud set pan , shower pan


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
mortar shower pan question tiki16 Concrete, Stone & Masonry 0 07-20-2014 07:56 PM
firebrick question Jasons34 Concrete, Stone & Masonry 16 07-08-2014 06:58 AM
Replacing tiles over old thick mortar bed brums22 Tiling, ceramics, marble 4 05-29-2013 06:46 PM
Blend mortar colors (w/ Sakrete mortar repair caulk) dredjohn Concrete, Stone & Masonry 3 11-11-2012 08:43 PM
mortar liquid bonding agent question drewhart Building & Construction 5 11-06-2008 07:45 PM




Top of Page | View New Posts