## Detail scales:

Question:
I’m having trouble with scaling my wall section details. I figured out the multiple viewports part but for example, The cantilever is perfect at 1:16, too big at 1:10, and too small at 1:20. The window Details is Perfect at 1:20, but 1:16 also works.

Response:
It is a good idea to keep your scales constant if you are able to line the might neatly in the detail sheet. Break the cantilever into two separate details one showing how it works where it intersects the wall below and one where it shows how the cantilever wraps around its protruding corner. For your details 1:10 (1 1/2″=1′-0″) is the least details you should scale use. I recommended to the class that they use 1:5 (3″= 1′-0″). 1:16 (3/4″=1′-0″ it is used in Imperial scale system) is not used in the profession and can cause problems in real projects 1:20 is sometimes used but that is not detailed enough of the scale to convey all the information you need in your details.

Common Drawing Scales equivalent:
“Soft” (rough) scale conversion

 Metric Imperial 1:1 Full Size 1:2 Half Size 1:5 3″= 1′-0″ 1:10 1 1/2″=1′-0″ 1:20 3/4″=1′-0″ 1:25 1/2″=1′-0″ 1:50 1/4″=1′-0″ 1:100 1/8″=1′-0″ 1:200 1/16″=1′-0″ 1:250 1″=20′-0″ 1:500 1″=40′-0″ 1:1000 1″=80′-0″

## roof insulation thickness

Question:
I had a question about the thickness of the batt insulation in the roof. You asked us to make it thicker than our deepest joist, in my case 220. However, I am not sure what can hold it. For example, the image I attached shows that the joist is flush with the slant of the roof, if I give ore space for insulation what can I add so there wouldn’t be a gap above the joist? Double studs (47×75)? If so, how far should I space them from the joist?

Response:
See the attached sketch in particular the parts labeled A, B, C, and D.
Because roofs tend to be the surfaces you lose most of your conditioned air it is the area that should have the most insulation if possible. The overall insulation area should be equal or greater (B>A) to achieve this you can put your roof furring strips (D) at a distance from your rafter. To support your roof furring strips you can use 18mm OSB or plywood (C) to connect them to your rafters.

## Tentative schedule

 Class date Lecture Schedule Readings Assignments Monday, 06, 1, 2020 01 Introduction – Collect names and pictures of students, assign logo for titleblock -Introduce Module A (existing building documentation and grid) Ching, Building Construction Illustrated, Chapter 1, pp. 1.02-1.06, Chapter 2, pp. 2.02-2.30, Chapter 12, pp. 12.02-12.05, 12.08-12.09 A01 Site Maps <-Intro [site, plan and grid] 02 Grids – Introduction to grids, explain scale and linetype in CAD Tuesday, 06, 2, 2020 03 Print – Introduction to lineweights, ctb files and layouts in CAD A01 Site Maps ->DUE A02 Plans and Elevations  Introduce Assignment A2 (Plans and Elevations) Wednesday, 06, 3, 2020 04 XREF s Elvations & Sections – Desk crits 05 Concrete, Mix -Desk crits elevations & sections A02 Plans and Elevations –>due Thursday, 06, 4, 2020 06 elevations & sections – Drawing standards (see #16) – Desk crits, open questions Allen and Iano, Concrete Construction Chapter 13, pp. 515-551 Ching, Building Construction Illustrated, Chapter 5, pp. 5.04-5.09, Chapter 12, pp. 12.04-12.05 Sketchbook check complete / incomplete 07 Concrete (cast in place) – Desk crits, open questions Allen and Iano, Sitecast Concrete Framing Systems Chapter 14, pp. 565-599 Ching, Building Construction Illustrated, Chapter 1, pp. 1.32 Chapter 3, pp. 3.16 Chapter 6, pp. 6.04 A03 Pin-up Monday, 06, 8, 2020 09 Foundations – Desk crits, open questions Allen and Iano, Foundations Chapter 2, pp. 29-38, pp. 56-71 Ching, Building Construction Illustrated, Chapter 3, pp. 3.02-3.26 15 Drawing standards to 06 Tuesday, 06, 9, 2020 10 DURA (Solar Decathlon project) – Desk crits, open questions [Module A complete] – sketchbook review including readings and desk crits Sketchbook Grated 1 0f 4 Assigned: B01 Reference material Assignment A4 due A04 Final Module A  ->due Wednesday, 06, 10, 2020 11 Wood – Desk crits, open questions Readings: Chapter 3, Pages 84 – 127, Fundamentals of Building Construction / Materials & Methods By Edward Allen & John Wiley (5th Edition) B01 Reference material  -> due Introduce B02 In class  basement and ground floor plans 12 Foundation Calculations B02a In class  –> due basement and ground floor plans Introduce B02 all plans Introduce B03 elevations Thursday, 06, 11, 2020 13 Framing types – Desk crits, open questions Readings: Chapters 5 and 6 Pages 161 – 253, Fundamentals of Building Construction / Materials & Methods By Edward Allen & John Wiley (5th Edition) B02 all plans –> due 14 Joists – Desk crits, open questions Sketchbook Grated 2 0f 4 –> due B03 elevations  –> due Introduce  B04 Joist Plans Monday, 06, 15, 2020 B04 Joist Plans Pin up 16 Studs layout – Desk crits, open questions B04 Joist Plans –> due Introduce B05 Stud Plans Tuesday, 06, 16, 2020 17 3D Framing B05 Stud Plans Pin up Introduce B06 3D Framing Midterm grades B05 Stud Plans –> due Introduce B07 Wall sections Wednesday, 06, 17, 2020 Thursday, 06, 18, 2020 18 Wall sections Part1 – Desk crits, open questions B06 3D Framing  Pin up 19 Wall sections Part2 – Desk crits, open questions Monday, 06, 22, 2020 20 Roof Tuesday, 06, 23, 2020 21 Stairs B06 3D Framing –> due 22 Building Envelope Wednesday, 06, 24, 2020 26 Mechanical B07 Wall sections –> due Heavily weighted grade Introduce B07 Wall sections Thursday, 06, 25, 2020 23 Redlining Module B pinup (all B assignments) Monday, 06, 29, 2020 Module C – 27 Heavy timber sizing – Desk crits, open questions Introduce B08 final                        (all documents) Tuesday, 06, 30, 2020 28 Heavy timber details – Desk crits, open questions Introduce Assignment C 29  High-tech wood construction – Desk crits, open questions Wednesday, 07, 1, 2020 – Final Examination – C Final Pin Up Sketchbook Grated 4 0f 4 –> due Last day of semester Assignment C –> due

## Schedule

 Monday/Tuesday Stairs B06 3D Framing –> due Thursday, 04, 30, 2020 Building Envelope Monday/Tuesday Mechanical B07 Wall sections –> due Heavily weighted grade Introduce B07 Wall sections Thursday, 05, 7, 2020 Redlining Module B pinup (all B assignments) Monday/Tuesday Module C Introduce Heavy timber sizing B08 final                        (all documents) Thursday, 05, 14, 2020 Heavy timber details Introduce Assignment C Monday/Tuesday High-tech wood construction Thursday, 05, 21, 2020 – Final Examination – C Final Pin Up Sketchbook Grated 4 0f 4 –> due Friday, 05, 22, 2020 Last day of semester Assignment C due

## Beam sizing

Question: I was trying to calculate the beam to use in my building. Can you check the attachment to see if it’s correct?
Answer: Yes, that works with the table Architect Studio Companion

Question: I also need help with finding the width of the beam.
Answer: A beam with is from 2 to 7 times smaller than its depth depending on the beam length. In your example dividing the death by three would equal roughly 5.25” would be a good estimation.

## Wall thicknesses

Question: Is it okay if my exterior walls for the Cooper Residency are 13” thick and the interior ones 6”?

Response: Yes, 13” is a good estimation of what a high performance wall might equal. Interior walls are typical typically just under 5” (4-3/4”) so that is a good number to work with.

## elevation development

A good start, I can review drawings online during class.

some quick thoughts on improvements:

• you should add a heavy weighted that line indicates the ground level.
• the lines of your cantilever are too heavy
• you should add elevation markers to show the relative Heights of the building
• You do not want to use multiple lines for the curves
• Give at least 8 inches of thickness to your slope roof
• With a dash line you can add the outline of the Cellar level

## 6:00 PM BT2 video conference link

The 6:00 PM Building Technology II class will connect today via Blackboards distance learning tool, see the announcement on blackboard. The Blackboards announcement contains a link to the video conference.

## MARCH 12th BT2 Support

Per CUNY requirements we will be switching over to a line format over the next few days. Today during class time, we will be utilizing online applications. Class will not meet in our classroom, we will be working on line.

We will be utilizing the following platforms:
Blackboard
OpenLab
ZOOM
Dropbox

Under: Content -> Project B [High-performance House] -> B03 [Draft] elevations

Try this link now [Thursday 3:40 PM]: https://zoom.us/j/4681523648

If you’re unable to Connect via the video link: You may use this discussion board to communicate.