Check out this one:
Let’s explore the wild world of complex wall partitions, show me what you got!
1 Like
lead shielding… radiology room ?
1 Like
An inch thick! I probably don’t want to know but it must be about radioactivity. X-ray facilities typically use 1 mm lead.
That must weigh a ton!
And it is still lightweight, I guess that it is something medical. I once had to do with a laboratory that needed small “rooms” that were made entirely from lead “bricks”.
3 Likes
@Anssi
@tweenulzeven
@ateliernab
For a radiology center. It varies throughout the facility from 1/16" to 1". You just have to adjust the filler:
Lead - Filler
1/16" - lvl 5 skim coat
1/8" - 2x lvl 5 skim coat
1/4" - 1/4" G.B.
1/2" - 1/2" G.B.
3/4" - 1) 1/2" G.B. 1) 1/4" G.B.
1" - 2) 1/2 G.B.
Additionally, the 1/16" and 1/8" lead sheets can be adhered to gypsum board instead of plywood, we call it “leadrock”. See below with the orange paper, (1/16", its HEAVY, so i dont want to move it).
The 1/4" - 1" I believe are 16"x42" lead fastened to FR Plywood. Hence the 7’.
Its pretty wild material. Don’t even get me started on Bullet Board…
- 4’ x 8’ sheet of lvl 5 bullet board = 474 lbs
2 Likes
Here’s this if anyone is interested:
Lead rock partition.skp (3.6 MB)
We did a police indoor firing range a while back where the walls had 1/2” thk. panels of AR500 steel, 4” ballistic rubber anti-spall/anti-ricochet panels, 2 layers of Kevlar fabric… then there were other material layers and methods to reduce noise. Sorry, can’t share the details.
2 Likes
We’ve put in bullet board for casinos, banks and some other places. The partition you described sounds interesting!
1 Like
Indeed – per square foot of panel material the AR500 steel was 22 lbs. and ballistic rubber was 34 lbs. Maybe I should request Nathan @medeek to add this assembly option in Medeek Walls 
2 Likes
8 page set of build ups to get a local builder on board for a project last year. Double stud wall, double layer roof. Currently being built.
Wall
Timber Frame
Spacer for Drywall
2x4 wall with comfort batt (installed from inside)
Sheating
Intello
Comfort Board
2x4 wall with comfort batt (installed from the outside)
Sheathing
Mento 1000
Rainscreen
Siding
Roof
Timber Frame
Spacer for TG ceiling
2x8 Framing with comfort batt (installed from inside)
Sheathing
Adhero
2x8 framing with comfort batt (installed from outside
Sheathing
Mento 3000
2x4 sleepers for cold roof venting
Sheathing
Ice and Water or Sim
Metal Roof
Eaves are vented to allow air to flow between sheathing for metal roof and the 2nd roof framing layer
5 Likes
I wonder how well these type of walls handle moisture.
That is the whole point. This was specifically designed for a client who spent 3 months in the hospital because his current house was completely overrun with black mold. He tore it down and built this on a new foundation. The owner specified no spray foams and wanted to limit any building product that would off gas into the living spaces. We initially specified TimberHP products:
In the end the owner chose Rockwool Batts and Comfortoard. Gross water infiltration is handled by the siding and rain screen coupled with the Mento 3000. Air sealing is done as a combination of the CDX plywood (no OSB), Mento 1000, taping all seams and joints, staggering the studs and batts, as well as a layer of Intello on the first layer of stud wall. Similar process was used for the roof. I consulted with both Rockwool and 475 (the local US distributor of the European smart barriers and tapes). We were using passive house ideas but trying to package them in a ‘pretty good house’ way of building.
The Rockwool products we specified here are hydrophobic. The idea being that when vapor or water gets into the walls it can 1) resist mold growth and decay and 2) release that moisture through the various layers and not trap it within the wall. Timber frame as the primary structure (for the entire house) complicated this approach a bit as normally one can use the Intello to the interior and make sure your walls are properly sealed / taped before drywall goes on. With the timber frame the drywall and where the air barrier would normally go is not continuous, so we moved that to the exterior of the first layer of stud wall. We have redundancy with the Intello, CDX and comfortboard, as well as the second layer of CDX and Mento. It is labor intensive and expensive.
2 Likes
That takes me back. I used to be involved in the design of bulletproof vests which were tested in our indoor firing range. The vests, made from Kevlar and ceramic tiles, had incredible stopping power, but the impact from the rounds could still be fatal. We tested all sorts of materials to provide shock attenuation and eventually settled on Chinese chicken feathers.
2 Likes
I was researching the Rockwool product for the project in this post because the client wanted it. I was skeptical of the rain screen assembly allowing it to get wet in theory, as well as the siding just floating on it with long fasteners. The project didn’t get built, so I never saw real world results. Recently I’ve had the TimberHP pitched to me and will be again in a week or so. It looks interesting.
Yeah, I have one right now where we are doing 2" outboard of the sheathing and then rain screen but the Rockwool tech I spoke with convinced me it would work. Comfortboard 80 or 110 - I think that changes the compressive strength. The one shown above has rain screen over CDX with the comfort board sandwiched in between the 2 walls.
Another company I work with uses 60mm Steico over 2x8 walls filled with TimberHP and then rain screen on top of the Steico. They do it in a factory and have it dialed in for their use case (custom high performance pre-fab packages).
I have a project I designed in PA that used the TimberHP - message me direct if you want to be put in touch with him (timber framer who built his parent’s house). He would chat with you if you are interested.
1 Like
PLY X-Ray
Placo® X-Ray Protection is an effective radiological protection alternative, which allows easier installation than that of lead-coated solutions. However, the installation must be carried out by a workforce specialized in radiation protection, to ensure the correct tightness of the area in question, as specified by a radiation protection specialist.
The fact that an area protected against X-rays reaches specific levels of radiation protection depends on the correct installation of the equipment, including the protection of the floor, doors and windows. It is also crucial to pay attention to those areas where radiation leaks could occur. For this reason, these installations should be carried out by a specialist.
Equivalence of lead thickness and number of ply layers
1 Like
Ive never thought about the floor… or the ceilings.
1 Like
