Exterior Construction Flashcards
What’s the thickness or rotary mahogany?
1/8-3-16
Or
2.7-3.5mm
How can you repair broken or damaged stud?
By “sistering”. Adding another piece beside it
What is filon?
FRP. Fibre reinforced plastic
What is the safest contact cement?
And what effects it’s drying time?
Water based
Water and pressure
What are the three types of rivets used on the air stream?
Pop
Buck
Olympic
What are the three types of sheets on the airstreams?
Banana wraps
Flat sheets
Segments
What size drill bits are used on the airstream?
20 and #30
How wide is the yoder siding before it is put through the roller? And how big is it after?
It starts at 16” and comes out 9” wide
What is the best way to carry tin?
Vertical with the lock down
How is aluminum siding installed?
From top to bottom using staples
What kind of windows is required on a motor home?
Safety glass
What are the three types of safety glass?
Laminated glass
Tempered glass
Plexiglass
What must the front windows be?
They must be laminated glass or have a cover over them
What is laminated glass?
Glass that has plastic between each layer of glass
What is tempered glass?
Single heat treated pain of glass that can be up to 5 times stronger. When it breaks it disintegrates into tons of tiny pieces
How should the glass be cut for the window frame?
Should be a 1/8” space all the way around to prevent stress
What should be your two emergency exits?
And where should they be located?
A door and a window or roof hatch
Must be on different walls and should not be higher then 36”
How big must a escape window be?
How big should a roof hatch be?
24x17”
21.6x21.6
What must the weight rating be on a step or bunk to access the emergency window?
305lbs
How big must the exit label be?
12mm high
What do you need on a unit with an escape latch out the roof?
Must have a ladder
How big are the usual roof vents and why?
14.5” to fit inside the normal 16” trusses
How far must an intake vent be from a sewer exhaust?
At least 36”
What can you use to patch a rubber roof?
Tedler tape
What is R-value?
It measures the insulation’s resistance to heat flow or thermal resistance
What are the 4 common types of roof coverings?
Aluminum
Fibreglass
Vinyl
EDPM
What does EPDM Stand for?
Ethylene propylene diene monomer rubber
What does TPO stand for?
Thermoplastic polyolefin
What is the number one cause of damage to caulking and rubber roofs?
The UV
What’s is a jaloozy window
Like a loover style
What’s is a jaloozy window
Like a loover style
What insulation has the greatest R-rating?
Pray foam urethane
What is a normal RV walls R rating
4-8R
What must a motorhomes door latch be?
DOT rated
What are laminated walls put together with and what must you keep in mind?
Contact cement
Working time and press time
For repairing fibreglass holes what grid grinding disc should you use to clean it? And how far should you grind?
36 and 3” around the hole
What filling fibreglass hole What degree of bevel should you put on it?
30 degrees
What is SMC?
Sheet moulded compound
What is liquid hardener?
Methyl Ethel ketone peroxide
What is cream gardener?
Benzoyl peroxide
What can you use epoxy on?
All metals, fibre plastic and all FRP
What can you use polyester resin on?
Doesn’t bond to metal and only use on polyester FRP
What is Fiberglass made from?
Extremely fine glass fibers
What is filon made from?
Made from polyester resin and chopper fibers
What is SMC made from?
Polyester resin and long chopped glass fibers
What is resin called once it is set?
Thermoset plastic
When doing fibreglass repairs, what should you use to clean the surface?
Acetone, composite cleaner or isopropyl alcohol. And scuff with #80 grit paper
What is another name for hardener?
The catalyst
What is used to repair thermosetting plastic?
Chemicals and adhesives
What is used to repair thermoplastics?
Welding
What is the most common plastic used in the RV industry?
Polyethylene
If you take a sliver or thermoset plastic and thermoplastic and put it in water. Which one will float?
Thermoplastic will float and will require an adhesive promoter
What are plastic welding heat elements and what do they get heated too?
A ceramic or stainless electric heating element that makes hot air at 450-650 degrees
What is the common working pressure for plastic welders?
3psi
What size plastic rod should be used on air and airless welders?
3/16 rod for air
1/8” rod for airless
How deap should the V groove be when welding?
75% of the way through and a 1/4” beyond damaged area
When spraying anything that requires a catalyst or hardener you are required to have what?
An air-fed type mask
What kind of gloves don’t allow solvents to penetrate?
Nitrile rubber
What is the recommended spraying distance for fast drying and slow drying products?
6-8 for fast drying products
8-10 for slow drying
How much of an overlap of spray should you do?
50% overlap
