truss training

8/13/2019 Truss Training

1/34

TRUSS TRAINING

EFFECTIVE APRIL 1, 2007 FAX # 715-876-5565 SECTION E, PAGE1

To understand roof and floor trusses,

one must understand engineeringand structural designs.

Design loads are expressed in pounds per square foot. Determining the amount of snow pack

a given area, over a period of time, will in turn lead to a given "Snow Zone". Requirement

roof condition studies have proven that the greatest snow pack, in a given time frame, lays ge

erally around the Great Lakes and as one moves away from the Great Lakes, the snow diminishes. T

results end up as a "Required Snow Zone" as it relates to a building. Different states have different id

as to how to handle these design factors.

Snow Zones are expressed as 40#, 30#, 20#, etc. Snow loads will vary with building class or design

and geographical location. To find out which zone you are working with, it is best to ask a building

inspector, "What's required".

General Class of Buildings:

Class A -- (100 years) permanent structures with a high degree of hazard to life and property

case of failure.

Example: High rise office buildings.

Class B -- (50 years) permanent structures with human occupancy.

Example: Dwellings, public buildings.Class C -- Structures having no human occupants.

Example: Farm buildings for cattle or machinery.

Live Loads/Snow Loads: Snow loads can be presented in two different ways:

Roof Snow Load and Ground Snow Load

Note: Be sure to verify which loading method is being used.

Ground Snow Load: 70 60 50 40 35 30 25

x 0.7 x 0.7 x 0.7 x 0.7 x 0.7 x 0.7 x 0.7

Roof Snow Load: 49* 42* 35* 28* 24.5* 21* 17.5*

Dead Loads:Weight of the truss, plywood, etc. This material is considered to be on the

structure 24 hours a day, all year long. Dead load is calculated from the weight of

the building materials supported by given structural members.

* Assumed valueExposure factor Ce = 1.0

Thermal factor Ct = 1.0Importance factor I = 1.0


2/34

WEIGHT OF CONSTRUCTION MATERIALS-ROOF, CEILING, & FLOOR REQUIREMENTS

TRUSS TRAINING

SECTION E, PAGE2 FAX # 715-876-5565 EFFECTIVE APRIL 1, 2007

Refer to local building code for live load requirements.

COMPOSITION ROOFING

235 lb. shingles and paper...................2.5 psf2-15 lb. and 1-90 lb.............................1.7 psf

3-15 lb. and 1-90 lb.............................2.2 psf

3-ply and gravel...................................5.6 psf

4-ply and gravel...................................6.0 psf

ROOF SHEATHING

3/8 in. plywood....................................1.1 psf

1/2 in. plywood....................................1.5 psf

5/8 in. plywood....................................1.8 psf

3/4 in. plywood....................................2.3 psf

1-1/8 in. plywood.................................3.4 psf1 in. sheathing (nominal)......................2.3 psf

2 in. decking.........................................4.3 psf

MISCELLANEOUS DECKING MATERIALS

Tectum.........................(1 in. thick)......2.0 psf

Insulrock......................(1 in. thick)......2.7 psf

Poured gypsum.............(1 in. thick)......6.5 psf

Vermiculite concrete.....(1 in. thick)......2.6 psf

Corrugated galvanized steel

16 ga. ...................................................2.9 psf

20 ga. ...................................................1.8 psf

22 ga. ...................................................1.5 psf

24 ga. ...................................................1.3 psf

26 ga. ...................................................0.9 psf

29 ga. ...................................................0.7 psf

ROLL OR BATT INSULATION

Rock Wool.....................(1 in. thick)......0.2 psf

Glass Wool....................(1 in. thick)......0.3 psf

ALPOL..................................................0.1 psf

RIGID INSULATION

Temlock........................(1 in. thick)......1.2 psf

Cork............................ (1 in. thick)......0.7 psf

Gold Bond....................(1 in. thick)......1.5 psf

Styrofoam.................... (1 in. thick)......0.2 psf

Foamglass.....................(1 in. thick)......0.8 psf

Rigid Fiberglass............(1 in. thick)......1.5 psf

SPRINKLING SYSTEM

Without ceiling......................................1.0 psfWith ceiling (be sure to add wt. of ceiling) ...1.5 psf

CEILING

Acoustical fiber tile...............................1.0 psf

1/2 in. gypsum board...........................2.0 psf

5/8 in. gypsum board...........................2.5 psf

Plaster (1 in. thick)...............................8.0 psf

Metal suspension system......................0.5 psf

Wood suspension system......................2.0 psf

FLOORS

Hardwood (Nominal 1 in.).....................3.8 psf

Concrete (1-1/2 in. thick)

Regular...........................................17.5 psf

Lightweight.....................................12.5 psf

Linoleum or soft tile..............................1.5 psf

3/4 in. ceramic or quarry tile..............10.0 psf

FRAMING MEMBERS (32 pcf)

Size 24 in. ctrs.

2 x 4.........................1.4 plf..................0.7 psf

2 x 6.........................2.2 plf..................1.1 psf

2 x 8.........................2.9 plf..................1.5 psf

2 x 10.......................3.7 plf..................1.9 psf

2 x 12.......................4.4 plf..................2.2 psf

TRUSS WEIGHT (Approximate)

Top Bottom 24 in. ctrs.

2 x 4 - 2 x 4...........5.2 plf..................2.6 psf

2 x 6 - 2 x 4...........6.1 plf..................3.1 psf

2 x 6 - 2 x 6...........6.9 plf..................3.5 psf2 x 8 - 2 x 6...........7.8 plf..................3.9 psf

2 x 8 - 2 x 8...........8.5 plf..................4.3 psf

2 x 10 - 2 x 8...........9.3 plf..................4.7 psf

2 x 10 - 2 x 10........10.0 plf..................5.2 psf

2 x 12 - 2 x 10........10.9 plf..................5.5 psf

2 x 12 - 2 x 12........11.6 plf..................5.8 psf

We suggest the addition of 1.5 psf for miscellaneous

dead loads.


3/34

TRUSS TRAINING



4/34

TRUSS TRAINING


TRUSS TERMINOLOGYBottom Chord:A horizontal or inclined (e.g., Scissors truss) member that establishes the lower edge of

a truss, usually carrying combined tension and bending stresses.

Butt Cut:Slight vertical cut at outside edge of truss bottom chord made to insure uniform nominal span.

(Usually 1/4 inch.)Cantilever:The condition where both top and bottom chords extend beyond a support with no bearing

at the extended end.

Chase Opening:An open panel in a floor truss for the purpose of running utilities through it such as

heating and air conditioning ducts.

Clear Span:Horizontal distance between interior edges of supports.

Concentrated Load:Superimposed load centered at a given point; (e.g., roof mounted air conditioners).

Dead Load:Any permanent load such as the weight of the truss itself, purlins, sheathing, roofing,

ceiling, etc.

Deflection:Movement of a truss (when in place) due to dead and live loads.Design Loads:The dead and live loads which a truss is designed to support.

Fascia:Trim board applied to ends of overhang.

Heel:Point on a truss at which the top and bottom chords intersect.

Heel Height:Height of truss at end of span (not including overhangs) =Plumb cut + Butt cut.

Interior Bearing Truss:Truss with structural support in the interior truss span as well as at end points.

Lateral Brace:A member placed and connected at right angles to a chord or web member of a truss,

(three trusses continuous required).

Live Load:Any loading which is not of a permanent nature, such as snow, wind, temporary

construction loads, etc.Overhang: The extension of the top chord of a truss beyond the bearing support.

Peak:Point on a truss where the sloped top chords meet.

Plumb Cut:Top chord cut to provide for vertical (plumb) installation of fascia.

Reaction:Total load transmitted to its support by a given truss.

Sealed Drawings:Drawings prepared, checked, and/or approved by and having the seal of a

registered professional architect or engineer.

Slope: (Pitch)The inches of vertical rise in 12 inches of horizontal run for inclined members

(generally expresses as 3/12, 4/12, 5/12, etc.).

Square Cut:End of top chord cut perpendicular to the slope of member.

Top Chord:An inclined or horizontal member that establishes the upper edge of a truss, usually

carrying compression and bearing stresses.

Uniform Load:A total load that is equally distributed over a given length, usually expressed in

pounds per linear foot (PLF).

Valley:A depression in a roof where two roof slopes meet.

Webs:Members that join the top and bottom chords to form the triangular patterns that give truss

action, usually carrying tension or compression stresses (no bending).


5/34

TRUSS TRAINING


Rain,Wind,Snow,Ice-

P.S.F.LiveLoad

Material,Roofing,Truss

P.S.F.DeadLoad

TopChord

ConnectorPlate

PeakorRidgeLin

e

Slope/Pitch

12

Inches

Deep

LateralBracing,TrusstoTruss

TopChordWedge

PlumbCut

Overhang

QuarterPoint

BottomChord

Splice

CantileverPost

Cantilever

SetBack

Bearings

Overhang

MaterialsCeiling-

P.S.F.C

eilingLoad

Slope-BC

ScissorsOnly

SplicePlate

Span

Webs


6/34

TRUSS TRAINING


SIMPLE TRUSS FACTS

Think of trusses as the cap of any building. Trusses take the place of a

hand frame rafter roof system and have specific engineering loads thata rafter system does not have. Trusses must rest on a true bearing. A

valid bearing is one that starts below the frost line and is sized to support the

roof loading required. A blue print will indicate each foundation footing loca-

tion. Here in the Midwest, a frost line is considered to be 42" deep.

Once you establish your bearing walls: Outside to outside will be your

truss span. The width of the plate the truss rests on will be 3-1/2 inch-

es unless indicated differently. A minimum of 3-1/2 inches is the

smallest ever recommended.The slope of the top or bottom chord is the "Rise

Over Run" in inches. 4/12 is considered a standard.

x x

42"+

Bearing WallBearing Wall

Truss


7/34

TRUSS TRAINING


TRUSS DESIGNS

Trusses are engineered to meet desired loading and spacing requir

ments. Load and and spacing requirements will be determined by th

local building official responsible for the inspection of the buildin

Trusses are designed using an engineering system that specifies lumber grad

and plate sizes to be used when building the truss. Each piece of lumber an

plate are considered component parts of the completed truss. None of the

components can be damaged or modified in any way unless directed by a stru

tural engineer. If a truss becomes damaged, or requires modification, a dra

ing showing an exact description of the truss and the damage or modificatio

to it must be provided to the engineer who will work up a repair detail. T

engineer will then work up a repair detail showing the exact steps required

repair the damaged truss. Note: The party responsible for the damage or mo

ification required is responsible for the engineering fee, this is why it is ve

important for your yard associates and also your customer to inspect truss

as they are received to verify that no damage has been done at time of deliver

HOW TO MATCH EXISTING TRUSSES

HEELHEIGHT

HEELHEIGHT

Overall Span

OverallHeight

Overhang Overha

To match existing trusses - Overall Span,

Overall Height, and Heel Height

MUST Be Included.


8/34

TRUSS TRAINING

SECTION E, PAGE8 FAX # 715-876-5565 EFFECTIVE MAY 1, 2006

DESIGNED LOADS ARE EXPRESSED AS FOLLOWS:42# PSF Live Load Top Chord (L.L.)

10# PSF Dead Load Top Chord (D.L.)

10# PSF Dead Load Bottom Chord (D.L.)

62# Total Designed Load (TOTAL)

Pounds PSF will change with different zones and building codes or consumer wishes.Examples:

1 2 3 4 5 6 7

40 30 20 40 24 32 24 L.L.

10 10 10 10 4 4 4 D.L.

10 10 10 5 1 1 5 D.L.

___ ___ ___ ___ ___ ___ ___

60 50 40 55 29 37 33 TOTAL

BEARING WALL SIZEWHY IS THE SIZE OF THE WALL IMPORTANT?

BEARING WALL

3-1/2 SEAT

CUT TO MATCHWALL

3-1/2 SEAT CUT DOESNOT MATCH 2x6 WALL

(5-1/2 SEAT CUT WOULDNOT MATCH 2x4 WALL)

LADDER SET IS NAILED

INTO COMMON TRUSS.

DROPPED END FRAMES

DROPPED END FRAMESDO NOT HAVE O.H.S.


9/34

TRUSSESPrompt ship residential trusses: Prompt ship residential trusses of varioutypes are ready for immediate shipment from MM Truss plant with no leatimes. Midwest will maintain a perpetual inventory of standard issue truss

for all customers to draw on.

Studded end frames: Each building has an end. An end frame will rest 100on a bearing wall and is not designed to clear span. Regular studded enframes will consist of a top chord, bottom chord, and studs 24" on centGable overhangs are nailed to the side of the top chord with a fascia boaattached. Common for a 1' gable overhang. Dropped ends have the top cholowered to allow 2x4 or 2x6 framing (as specified on S.O. contract by custometo pass over the top chord and attach to the first common truss that is back

from the dropped end. This allows for a greater gable overhang and is struturally sound.

Cantilever Conditions: To accommodate design needs for level overhansuch as in patios, porches, entryways and other offsets in building elevationthe truss may be cantilevered. A cantilever occurs when the bearing fainside the overall truss span. Variations of cantilever conditions may achieved by use of methods available in the form of truss engineering. ordering cantilevers, the cantilever dimension is the distance from the outsi

of the bearing wall to the end of the bottom chord at the scarf cut. (See below.) The overhang is the horizontal distance from the bottom chord butt cto the outside edge of the top chord. (See B below.) NOTE: By giving tdimension in (example C) the truss designer will not be able to make a detemination of what the overhang or cantilever should be. This could cause aerror to occur.

TRUSS TRAINING


CA

CantileverStrut

B

Right Wrong


10/34

TRUSS QUOTE REQUEST FORM

Store Location________________________

Customer Name

Customer Address

Associate Name_______________________

Date____________________

Phone #_________________

Qty Span Pitch Load Type Overhangs On Center Truss PlantUse Only

5 30 6/12 40-10-10 Reg. w 4 2 2

cant one side

TRUSS

TRUSS TRAINING


CANTILEVERSTHE PROPER WAY TO ORDER CANTILEVERED TRUSSES

(ROOF AND FLOOR). ENTER IN THE SPAN, THE TOTAL SPAN

OF THE TRUSS. THEN, LIST THE CANTILEVER AS THE DIF-FERENCE BETWEEN THE TRUSS SPAN AND THE BEARINGS.

(AS SHOWN BELOW)


11/34

TRUSS TRAINING


TRUSSESEnergy Truss: This is a truss designed to allow greater insulation depths the bearing point. It is normal to use different types to meet the insulatiorequirement. The customer is to specify the energy heel height desired.

Scissor Truss: (Vaulted) A truss designed with a slope on the outside aninside. A building blue print may call for a vaulted ceiling over a given areFor design purposes, we recommend using half of the top slope of the top choron the bottom chord. For a truss with a 4/12 top chord, we would recommena 2/12 on the bottom chord. Normally, this is expressed as a 4 over a 2/1Using half of the top slope will assure load factors will be maintained.

Mono Truss: Used when adding on to an existing building. The highest poibeing at the existing wall.

Hip Sets: A hip roof is one that slopes from all sides. The system consists a girder truss (normal set back is 8'), corner girder, corner jacks, and enjacks. There will be step down trusses from the girder truss to the peak. the peak, common trusses are used to complete the run. See hip set page MM price book for an example.

Valley Sets: Valley sets are used to form the ridge line and framing betwee

the main and secondary roof structure, and can be common, dual pitch, mono shaped in their design. Valley members may also be used for decoratigables, dormers, porches, etc. Flat top valley members are supplied wherequired for hip roof applications.

Room-in-Attic: Trusses that have a room within the truss. This design is ve

hard to engineer, due to a rectangle within a triangle. To allow for a usab

room size, the top chord slope gets quite steep. Caution on trucking.


12/34

Beam/Girder Trusses:

Beam trusses must be designed to span a given area with trusses coming in

from the side and secured to the bottom chord. These may be 2 ply, 3 ply, or

more depending on the load requirements. Beam trusses may also be designed

to meet different bearing widths. 3-1/2 inch and 5-1/2 inch are minimum

bearings. The girder truss is used to eliminate an interior load-bearing parti-

tion in L, T, U, and H-shaped houses by supporting the flush cut end of the

main roof trusses at the intersection of the roofs.

TRUSSES

Ridge Line:The Ridge line on a hip set runs from the bearing corner to a point

that is 1/2 of the span. A bearing wall that is 30 wide will have a ridge that

meets 15 from the center point. This is true for all slopes. (Any time you have

a 45 degree angle coming from a given base, the lines will intersect back 1/2

of the base.)

45

15'

1/2 of Base

Base

30

45

TRUSS TRAINING



13/34

GIRDER TIE-IN-SPANWHAT IS TIE-IN-SPAN?

In order to properly load girder trusses we need to know the tie-in-span.The tie-in-span is the length (span) of the trusses the girder is supporting

The tie-in-span of the example above is 20 0.This information is needed to process both

quotes and orders.

TRUSS TRAINING



14/34

TRUSS TRAINING


FLOOR TRUSSES:

These trusses take the place of a floor joist system. Floor trusses offer the

following advantages:

1. Reduced installation time.2. Wide 3-1/2" nailing surface.

3. Plumbing / electrical placed inside webs.

4. Clear span basement with no beams or posts.

5. Lowers construction costs.

6. Ready to finish ceiling.

-- and more --

Standard design load is 55# PSF This is a recognized standard in allzones. This maybe greater, if desired, for special conditions. Your Midwest

price book has a "Maximum" span chart for your use. The overall depth of a

truss and space on center will vary depending on the span and load desired.

Standard bottom chord bearing truss will have 2 vertical 2 x 4's. The

outer 2 x 4 will be cut back 3-1/2 inches to allow for a 2 x 4 ribbon, tie in. A

double notch is available upon request.

2x3 web trusses and metal web trusses are also available.

Top chord bearing has a double 2 x 4 top chord that will rest on your sill

plate. This truss can be ordered with a block attached to raise the truss end

condition to a desired height. Top or bottom chord bearing are equally as good.

In ordering floor trusses, it is recommended that you allow for the outside

sheathing width by subtracting this space from the truss. On top chord bear-

ing trusses you must subtract the wall width and allow an extra 1/4" on each

side for clearance (bottom chord). The truss should not touch the inner wall.

Trusses must move freely as loads change.Any openings, such as a stairway, can be worked around by installing a

double truss on each side. In other words, you have established a beam truss

on each side. It is also a good idea to have the heating & A.C. subcontractor

verify duct clearance before ordering. Midwest Manufacturing may be able to

accommodate special order custom sized duct runs.


15/34

Large and odd sized trusses can be accommodated at MMTruss. They are generally designed & shipped in section

with special engineering that allow them to be assembled osite. Larger trusses that require a field splice will carry witthem proper splice directions and materials to be used.

POST FRAME ROOF TRUSSES:

Post frame is apart from conventional framing since it is of different design an

use. This method is for ease of construction and is used for maintenance fre

utility-type agricultural, residential, & commercial buildings. By using hozontal side and end girts and roof purlins, one can space the trusses to redu

the cost and still maintain design loads required. Common space of truss

will reach from 6', 8', 9', and in some cases, 10'. Post frame trusses are bu

using 2 x 6 or larger lumber. Several of our MM-Prompt ship Post Frame trus

es have been designed to meet different loads at different spacings. The fo

lowing page has a chart showing loads achieved at different spacings.

Due to the fact that overhangs are added at the time of erection, trusses abuilt with a heel to be covered by siding. The heel height is determined by t

angle of cut of the bottom and/or top chord. A standard heel is 7-7/8" in siz

Spec. sheets for trusses will indicate the purlin spacing for the top chord. T

and bottom chord bracing (purlins) must be designed by the building design

who will determine size, orientation, etc... In this type of building it is comm

to have no ceiling and as a result, most trusses have no ceiling load designe

in. If a ceiling is planned, the truss must have a bottom chord designed

carry the weight. Normal load is 5# PSF for a ceiling in a post frame designtruss.

End frames for a post frame building should be supported by a post th

is not more than 10 feet from another post. All door openings should have

post on each side, on end, or sidewalls.

TRUSS TRAINING



16/34

TRUSS TRAINING


TRUSS LAYOUT:To assist in truss needs, one must understand truss layouts. It is best to work

with grid paper. A truss layout is a great selling tool because the sales person

and customer can see problems on paper, before construction begins.

Page 17 is a standard plan. Use that page as a worksheet and draw in

the roof system as you see it. Use a 4/12 slope with 2' O.H. The scale is 1/8"

= 1'. Good Luck!!!

THE PROMPT SHIP TRUSSES SHOWN BELOW ARE DESIGNED TO CARRY A35# LOAD AT 9 O.C. THEY CAN BE USED AT DIFFERENT SPACINGS TO

ACHIEVE ADDITIONAL LOADING. USE THE CHART BELOW AS A GUIDE FOROTHER LOADS.

SPAN TRUSS LOADINGS

SKU# 4 O.C. 5 O.C. 6 O.C. 7 O.C. 8 O.C. 9 O.C. 10 O.C.

20 187-7397 59# 55# 49# 45# 39# 35# 29#

24 187-7410 59# 55# 49# 45# 39# 35# 29#

26 187-7436 59# 55# 49# 45# 39# 35# 29#

30 187-7452 59# 55# 49# 45# 39# 35# 29#

32 187-7368 59# 55# 49# 45# 39# 35# 29#

36 187-7481 59# 55# 49# 45# 39# 35# 29#

40 187-7601 59# 55# 49# 45# 39# 35# 29#

LLTC 50 50 40 40 30 30 24DLTC 4 4 4 4 4 4 4

LLBC 0 0 0 0 0 0 0DLBC 5 1 5 1 5 1 1TOTAL LOAD 59# 55# 49# 45# 39# 35# 29#

LIVE LOAD

TOP CHORD

DEAD LOAD

TOP CHORD

LIVE LOAD

BOTTOM CHORDDEAD LOAD

BOTTOM CHORD

TRUSSES OVER 36 REQUIRE JOBSITE DELIVERY


17/34

Drawing #1

22'

Ridge LineVault

56'

Ridge

Line

4' 6'

28'

16

'

32'

TRUSS TRAINING



18/34

TRUSS TRAINING


Now that you have completed Drawing #1: Check against Drawing #2--Page

19.

This is how I see it.

The vault must end where the 16' room starts.

On one end you need a cantilever truss.

On Drawing #2--Label the trusses.

Drawing #3 shows how I labeled the trusses.

Using your naming system, write down what you would order from the Truss

Plant.

Do this on scratch paper.

Compare your answers with Drawing #4.

Did you get them all correct?

If not, go back and correct your work.


19/34

TRUSS TRAINING


Drawing #2

22'

56'

4' 6'

28'

1

6'

32'


20/34


21/34

Drawing #4

TRUSS TRAINING


12

4

7 Req 4/2/12

26' Scissors

2' O.H. one side

15 Req 4/12

26' Common

2' O.H.

2 Req end frame

4/12 26'

5 Req 4/12

26'

Cant 4' one side

2' O.H.

2 Req 4/12

1 end frame

16' 2' O.H.

1 Req, 4/12, 16'

Beam Truss w/ 26'

Tie in 26'

1 Valley Set 16'

4/12

A

C

D

E

F

A

0' 2'26'

12

4

12

2

2' 2'26'

B

C

12

4

2' 2'22'

26'

D

12

4

16'2'2'

E

12

4

16'

B


22/34

TRUSS TRAINING


Drawing #5--this is the same building. This time, draw a hip roof sys-

tem. Use 4/12, 2' O.H.

Problem: The vault is now "No Vault". (Very hard to vault a hip system).

It can be done, but the cost is GREAT!

Cantilever a hip is also very hard. Try to stay away from these conditions.

In this case a header is recommended.

Drawing #6 is how I see it. Compare your work to mine.

By "Getting Into" blue prints, they become easier and you will find your-

self doing harder prints as time passes. Each print is a new ball game and you

must follow each step on each print.

A word ofCAUTION: Do not read more than what you see. Keep in mind

that you are an estimator only and not an engineer doing design work.


23/34

TRUSS TRAINING


Drawing #5

22'

56'

4' 6'

28'

1

6'

32'


24/34


25/34

TRUSS TRAINING



26/34

TRUSS TRAINING



27/34

TRUSS TRAINING


EDIElectronic Data Interchange


28/34

TRUSS TRAINING


CAMERAS HAVE BEEN FURNISHED TO ALL MENARDSCCS DEPARTMENTS.

Following the guidelines in Policy and Procedure 16D, pleasephotograph all blueprints and send them to Midwest Truss.

This will result in the fastest turnaround time.

Quotes returned from MM Truss are spooled to the stores.


29/34

TRUSS TRAINING


Please E-Mail difficult house plans if possible, otherwise send through Inter-Company mail,dimensions do not fax legibly and dimensions cannot be scaled from fax copies.

If mailing, please send full size blueprints when possible. This saves time in designing thetruss layout, verifying dimensions, and makes the truss quote more accurate.


30/34

TRUSS TRAINING


As we receive plans designed by these companies from the stores we add them to

our library of plans. Before you E-Mail or send a set of plans designed by these

companies, fax or call to see if we have the plan and/or quote on hand.

The prices shown in your price book are list prices. Please make sure that all associates

understand that the stores cost on list price items is found by multiplying by .FH. After

achieving store cost add your mark-up.

MM Electronic Catalog

Please use your Catalog. It contains many sku numbers that may note be easily

found on the VDU. The catalog has many details and views that may help inexplaining such things as hipsets and dropped ends to your guests.


31/34

TRUSS TRAINING


PRO

BLEMSWITH

OVERHANGSONPOSTFRA

METRUSSES

1

)OVERHANG

SONPOSTFR

AMETRUSSE

S

CAUSEEXT

RACUTTINGA

TSITEFORF

ASCIA.

2

)OVERHANG

SONPOSTFR

AMETRUSSE

SMAKE

THEMMORE

DIFFICULTTO

TRANSPORT

WITHOUT

DAMAGINGTHETRUSS.


32/34

TRUSS TRAINING


QUIZ

NAME_____________________DATE__________LOCATION____________________

1. WHO DETERMINES THE LOADING REQUIRED FOR ROOF TRUSSES?

2. WHAT DO THE NUMBERS 42-10-10 MEAN AS APPLIED TO A ROOF

TRUSS? AND 40-10-5 AS APPLIED TO A FLOOR TRUSS?

3. WHEN ADDING ROOF TRUSSES TO AN EXISTING BUILDING ANDADDING TO AN EXISTING RUN WHAT THINGS NEED TO BE CONSIDERED?

4. IF A SPLICE OR CONNECTOR PLATE IS LOOSE OR DAMAGED ON A

TRUSS, WHAT ACTION CAN YOU TAKE?

A. POUND IT BACK INTO THE TRUSS.

B. DESTROY THE TRUSS AND CUT IT BACK FOR USABLE STOCK

LUMBER.

C. GET A NEW CONNECTOR PLATE FROM THE HARDWARE

DEPARTMENT AND REPLACE IT AT THE STORE.

D. REPORT IT TO YOUR SUPERVISOR.

E. PUT IT IN THE YARD BARGAIN AREA.

F. SEND IT ON A BACKHAUL TO MIDWEST MANUFACTURING AS

DEFECTIVE.

G. CALL OR FAX MIDWEST TRUSS TO HAVE IT RE-ENGINEERED.

5. WHAT IS STRONGBACK OR LATERAL BRACING AND WHERE IS IT

USED?


33/34

QUIZ

6. IF A GUEST NEEDS TO SPAN 32 8 WITH A 4X2 WOOD WEB FLOORTRUSS, WHAT OPTIONS DOES THE GUEST HAVE? (HINT: THERE ARE 7

OPTIONS)

7. MOST HOUSING CONTRACTORS HAVE EXPERIENCE WITH BUILDING

RAFTER ROOFS. GIVEN THEIR EXPERIENCE AND KNOWLEDGE OF

BUILDING ROOF SYSTEMS ITS ALRIGHT FOR THEM TO MAKE MINOR

TRUSS MODIFICATIONS.

TRUE OR FALSE?

8. WHAT 7 PIECES OF GUEST INFORMATION SHOULD BE INCLUDED IN

THE TRUSS DESIGN ESTIMATE FORM?

9. ONE OF THE SELLING POINTS OF FLOOR TRUSSES IS THE ABILITY T

RUN DUCT WORK BETWEEN THE WEBS. SHOULD THE HEATING AND

AIR-CONDITIONING SUBCONTRACTOR BE CONSULTED BEFORE THE

TRUSSES ARE ORDERED?

YES,TO MAKE SURE THAT THE DUCTWORK WILL FIT BETWEEN THE

WEBS AND THAT THE ON CENTER SPACING ALLOWS ENOUGH CLEAR-

ANCE TO SNAKE THE DUCTWORK INTO THE TRUSSES OR SLIDE IT IN

FROM THE ENDS.

NO, ALL DUCTWORK WILL FIT IN BETWEEN THE WEB SPACING. THE

SIZE CHART IN THE MIDWEST BOOK IS USED TO CONFIRM THIS.

TRUSS TRAINING



34/34

TRUSS TRAINING

QUIZ

10. THE RIDGELINE ON A HIP SET ROOF WILL MEET HOW FAR BACK

FROM THE CENTER POINT OF THE BEARING WALL?

11. CAN MIDWEST MANUFACTURING TRUSS DESIGN ATTEMPT TO

ACCOMMODATE OR INCORPORATE LARGE DUCT RUNS INTO FLOOR

TRUSSES?

12. WHAT IS THE MAXIMUM HEIGHT OF A TRUSS THAT MIDWEST MANU-FACTURING CAN HAUL AS A 1 PIECE TRUSS?

13. WHAT IS THE RECOMMENDED PROCEDURE THAT NEEDS TO BE

USED WHEN LIFTING TRUSSES WITH SPANS BETWEEN 30 FOOT AND 60

FOOT?

14. WHAT IS THE RECOMMENDED PROCEDURE THAT NEEDS TO BEUSED WHEN LIFTING TRUSSES WITH SPANS IN EXCESS OF 60 FOOT?

15. WHAT IS A DROPPED END FRAME AND WHERE AND WHY ARE THEY

USED?

WHEN COMPLETE SEND IN THE INTER-CO. MAIL T0:

MM G.O. ATTN: SALES MANAGER

truss training

Documents