Discover the intricacies of interior wall types and sections drawing and how it's vital in architectural planning. Learn how to decipher the graphical representations and legends to understand the wall type, fire rating, stud size, description, acoustical rating and other labeling information.
Key Insights
- The article provides a detailed overview of the interior wall types and sections drawing, teaching how to read and interpret different elements like wall type, fire rating, stud size, description, and acoustical rating.
- The article highlights the significance of different graphical cues such as dashed lines to indicate a metal stud wall, the letter X for blocking, and wood grain to depict wooden sections. Different call-outs and notes are also crucial for understanding specifics of the entities within the wall.
- Detailed explanations about the difference between a one hour rated wall and a two hour rated wall are provided, emphasizing the role of layers of gyp board in increasing the protection and fire rating of a wall.
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Let's spend a few minutes on our next drawing of interior wall types and sections. Again, I'll refer to the interior partition legend, where you can see they’re reiterating what we saw earlier. Here’s the legend, pointing to a wall, including the designation for wall type, fire rating, stud size, description, and acoustical rating—all the information is labeled.
Let me zoom out a bit. Here we have a wall type header under a joist and a header adjacent to an I-joist. So again, when I look at the drawings, do you see the little dashed lines? This is a graphic representation indicating that I have a metal stud wall.
You can see where the screws would be, attaching the two pieces together. The details are well shown. You can see there’s a Hilti firestop spray over mineral wool batts, per a specific detail.
When I look up here, I see the 'X', which indicates blocking. I see the wood grain here. This indicates that, up here, I have wood on both sides.
Down here, there’s metal. They’re calling out the number of layers of gypsum board, 5/8-inch type X, where type X means fire-rated gypsum board. This is a two-hour rated assembly.
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There are many notes calling out the specifics of the elements within the wall. You can see different hatches representing various materials, a callout for a glue-lam beam, sheathing, roof framing, the roof over the cover board, and rigid insulation.
Here are more details. You can see the reference to the grid lines of the building here, and an enlarged detail here, which would be image B2 on sheet A413.
Similar to the other drawing, we have the wall heads perpendicular to the joists. Again, here are the joists coming toward us. You can see the wall here. Here again is the top chord of the joist, which is this part up here and here.
I have the bottom chord here and here, and you can see they’re calling out for continuous fire-stopping material.
Here we have other drawings similar to what we saw before, including a base, a plan intersection, a section, and the head detail.
I can look up here, and you can see it references details. Again, here’s the section, showing the lay-in ceiling and the gypsum board ceiling.
Again, the plan view shows how this wall connects to the other wall, and then the base conditions.
This is for a one-hour rated wall. This is for a two-hour rated wall.
The key difference is the number of layers of gypsum board.
You can see here that it calls for a 5/8-inch type X gypsum board, and then the finish schedule for the material.
There is also a note for two layers of 5/8-inch type X gypsum board.
So again, there’s more protection on a two-hour wall than on a one-hour wall.
That’s a good overview of this drawing. Please take some time to review the PDF.
The details are excellent. Now, let’s move on to our next drawing.