Showing posts with label Tuck Pointing. Show all posts
Showing posts with label Tuck Pointing. Show all posts

Saturday, June 12, 2010

Brick Assessment

Mostly, the mortar joints are pretty good on the house. Except, in front, the rain runs off the roof and pours onto the side porch, which gets behind the wall. The porch deck is something funky, too. It appears that the original porch deck was probably concrete and poorly constructed. That deck deteriorated, and the fix was to pour another concrete slab on top of the old one. At the doors, the concrete porch elevation is about two and one half inches above the thresholds. This creates an odd gap.
I want to rebuild all of this in the proper way. My confidence level in myself is high in regards to my ability to tuck point the brick. I think I could eventually cast new caps for the porch wall. Here it is:
The rain runs off behind this wall, and see how it leans!? The mold growing on the wall shows how the water is flowing within the bricks. You can see the deteriorated wall cap. I will make rubble out of the cap and take down this wall. I will pull it down from this column in the foreground, from the top courses down to the course that is solid and level. The destruction will continue to pull apart all the failed brick work to the corner and around to the column at the steps.
This will make access to the concrete porch much easier. Then, all the concrete deck will be pounded into rubble and removed, along with the poor, loose, back fill underneath.
I will install a system to drain the water off the porch. Then I will build everything back, Federal Grade.
In the mean time, I can begin to tuck point the other parts of the front walls and the rest of the house that do not need complete re-building.

Friday, June 11, 2010

Tuck Pointing Start

Our Argenta Craftsman Home is a sturdy brick house. The Brick is laid on top of a footer wall that is about ten inches thick and about three feet tall, except in back where there is a basement and the walls are about eight feet tall. However, the mortar between the bricks is very soft, like sand that is held together with a little dried mud. There are definite guidelines of the National Parks Service Historic Preservation Briefs in regards to tuck pointing bricks and the types of mortar to be used.
I think I am drawing closer to being able to attack this weakness in our house to make important improvements. This is the first page of the brief covering tuck pointing.
2   Technical Preservation Services, HPS, masthead; link to ParkNet

Home page logo: Soft mortar being used for repointing. Photo: John P. Speweik.

Repointing Mortar Joints in
Historic Masonry Buildings

Robert C. Mack, FAIA, and John P. Speweik »Historical Background
Identifying the Problem Before Repointing
»Finding an Appropriate Mortar Match
»Properties of Mortar
»Mortar Analysis
»Components of Mortar
»Mortar Type and Mix
»Budgeting and Scheduling
»Contractor Selection
»Execution of the Work
»Visually Examining the Mortar and the Masonry Units
»Summary
»Conclusion
»Selected Reading


A NOTE TO OUR USERS: The web versions of the Preservation Briefs differ somewhat from the printed versions. Many illustrations are new, captions are simplified, illustrations are typically in color rather than black and white, and some complex charts have been omitted. 

Near the end of this brief there are two charts which have made my requirements clear:
Mortar Types(Measured by volume)
Designation Cement Hydrated Lime
or Lime Putty
Sand
M 1 1/4 3 - 3 3/4
S 1 1/2 4 - 4 1/2
N 1 1 5 - 6
O 1 2 8 - 9
K 1 3 10 - 12
"L" 0 1 2 1/4 - 3



Suggested Mortar Types for Different Exposures
Exposure
Masonry Material Sheltered Moderate Severe
Very durable:
granite, hard-cored brick, etc.
O N S
Moderately durable:
limestone, durable stone, molded brick
K O N
Minimally durable:
soft hand-made brick
"L" K O

I had made a visit to Acme Brick, here in town, and they referred me to the local office if Ash Grove Cement. I was connected to a salesman that affirmed that I probably needed type O, as above. He was speaking off the top of his head by memory, so this tells me he is probably the person to go to for this.