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Very quickly review גמרא דף יד “אמר רב ששת until the two dots (two lines before the medium size lines)
Question:
Why does ר’ יהודה not require קורה to be strong enough to support a brick?
Learn ר’ יהונתן משנה יג: “ר’ יהודה & דף ב. “ור’ יהודה
Questions:
Do the two קורות combined need to be a tefach wide?
Learn ריטב”א דף יד. “וכן
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=21
When using two 1/2 tefachim קורות how much space can be between them?
Learn רבינו יהונתן
Learn רמב”ם ה’ שבת פרק י”ז הלכה כה
Learn שולחן ארוך ס’ שס”ג סע’ כב
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=60
Learn ביאור הלכה ס’ שס”ג סע’ כב “שצריך
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61
Do the Rabanan also permit two קורות at different height elevations?
Learn רא”ש ס’ יח’ (in middle)
Learn ריטב”א דף יד. “ר’ יוסי בר’ יהודה
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=22
Is there a limit to the height distance between two קורות placed at different height elevations?
Learn תוס’ דף יד. “ובלבד
Learn רמב”ם ה’ שבת פרק י”ז הלכה כה with the מגיד משנה who explains the Rambam argues on רבינו יהונתן and asks on the Rambam how could we combine two קורות that are at different elevations even with distance greater then three tefachim when the Gemara Sukkah says we do not combine them when the width of the beam is less than a tefach wide (same question as תוס’ “ובלבד) ?
Learn כסף משנה for a different explanation in the Rambam and different answer to Tosfos question
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=77
Learn שולחן ארוך ס’ שס”ג סע’ כג
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61
Learn the גמרא דף יד. “ר’ יהודה אומר (two lines before the medium size lines) until “עגולה” (two dots – fourth wide line)
Why according to the Rabanan does a קורה which is four tefachim wide not need to be strong enough to support a brick?
Is a four tefachim wide קורה made from straw or twigs kosher?
Learn ביאור הלכה ס’ שס”ג סע’ י”ז “חזקה
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=60
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61
According to the opinion of the Shulchan Aruch סע’ כב that two קורות combined can only be maximum one tefach apart from one another. Could they combine to create a קורה which is four tefachim wide and therefore be allowed to be 2 1/2 tefachim apart from one another ?
Learn ביאור הלכה ס’ שס”ג סע’ כב “בתוך טפח
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61
What if the physical material of the קורות total four tefachim but there are gaps in between?
See השגת חזון איש