1103 - Framing the Roof September 18-24, 2000 | March 19-25, 2001 HI, I'M BOB VILA.
WELCOME HOME AGAIN TO THE COMMUNITY OF I'ON,
A BRAND-NEW NEIGHBORHOOD
THAT'S BUILDING HERE IN MT. PLEASANT, SOUTH CAROLINA.
OUR HOUSE IS FRAMED,
AND TODAY WE'RE LOOKING AT SOME OF THE TECHNOLOGY
THAT GOES INTO AN OLD-STYLE HOUSE
TO MAKE IT WORK WELL IN THE 21st CENTURY.
TYVEK, WHICH IS GOING AS A HOUSE WRAP,
TECHSHIELD, WHICH IS A PRODUCT THAT CONSERVES ENERGY,
AND ALL SORTS OF TYING MATERIALS
TO MAKE SURE THAT THE WINDS DON'T BLOW IT AWAY.
STICK AROUND. IT'S GOOD TO HAVE YOU HOME AGAIN.
CAPTIONING MADE POSSIBLE BY SEARS
THERE ARE OVER 70 HOUSES UNDER CONSTRUCTION
HERE IN I'ON, BUT I THOUGHT WE'D START OFF TODAY
BY LOOKING AT SOME OF THE ONES
THAT HAVE ALREADY BEEN COMPLETED.
BEHIND ME IS A BEAUTIFUL EXAMPLE
OF LOW-COUNTRY ARCHITECTURE AT ITS FINEST
WITH LOTS OF REALLY ELEGANT DETAILING.
IT'S A PINK STUCCO HOUSE
IN THE TRADITION OF THE EARLY 19th CENTURY
WITH QUOIN COURSES FITTED TO THE STUCCO ALONG THE CORNERS,
THESE BEAUTIFULLY DECORATIVE STARS
THAT WERE ORIGINALLY MADE OUT OF CAST-IRON
AND WERE INTENDED TO HOLD BRICK STRUCTURES TOGETHER.
WELL, NOW THEY'RE JUST A DECORATIVE ELEMENT.
AND, OF COURSE, THE TYPICAL PORCHES--
THE DOUBLE-STORIED PORCHES WITH THE WHITE COLUMNS
AND THE PANELED CEILINGS AND THE FANS
AND THE BEAUTIFUL BALUSTERS.
THIS IS ONE OF THE PRETTIEST HOUSES HERE IN I'ON
AT THIS POINT AND IT'S A HOUSE THAT TRIES
TO REALLY HONOR THE HISTORIC TRADITIONS
OF SOME OF THIS ARCHITECTURE.
BUT IF YOU LOOK OVER MY LEFT SHOULDER,
SOME OF THE HOUSES DOWN THIS LANE,
WHICH IS KNOWN AS PRESCIENT STREET,
ARE ALSO VERY GOOD EXAMPLES
OF WHAT WE CONSIDER THE BEST OF CHARLESTON ARCHITECTURE,
LOW-COUNTRY ARCHITECTURE.
THE 3 IN A ROW DOWN THERE,
THE BRICK AND THEN THE PINK STUCCO
WITH THE PEDIMENTS AND THE DOUBLE PORCHES AND THE COLUMNS,
ALL OF THESE ELEMENTS,
WHICH TOGETHER WITH OTHER THINGS
LIKE THE BEAUTIFUL TIN ROOFS OR THE METAL ROOFS
REALLY GIVE YOU THE FLAVOR OF THE OLD SOUTH
AND THE FLAVOR OF THIS COMMUNITY.
THIS IS SOWELL STREET THAT WE'RE WALKING DOWN
AND HERE WE GOT SOME OF THE FIRST HOUSES
THAT WERE BUILT IN I'ON
WHICH REALLY GIVE YOU AN IDEA
OF THE PROXIMITY BETWEEN THE HOUSES
BECAUSE THESE ARE ALL TIGHT URBAN LOTS
AND BY HAVING THE HOUSES CLOSE ENOUGH TOGETHER
THAT YOU CAN KIND OF TALK FROM ONE PORCH TO THE OTHER
YOU HELP TO CREATE THAT FEELING OF NEIGHBORHOOD.
AND, OF COURSE, YOU HAVE JUST ENOUGH SPACE
TO ALLOW FOR SOME NICE BREEZE CIRCULATION THROUGH HERE.
AND THESE HOUSES ALL BENEFIT FROM THE VIEW
OF EAST LAKE, WHICH IS ONE OF TWO LAKES HERE IN THE NEIGHBORHOOD.
AND, OF COURSE, THIS ONE HAS BEEN BUILT
WITH THE TYPICAL PALM TREES AROUND IT
SO THAT YOU GET THE FEELING OF BEING IN THE BATTERY PRACTICALLY.
IF YOU LOOK BEHIND ME, ACROSS THE LAKE,
YOU CAN SEE THAT THERE
ARE ABOUT A HALF-DOZEN HOUSES UNDER CONSTRUCTION.
BUT RIGHT NOW, LET'S GO FIND OURS.
THIS SPECTACULAR TREE IS A LIVE OAK.
YOU KNOW, IN MOST AREAS WHEN A DEVELOPER COMES IN
TO PUT IN A NEW COMMUNITY,
THEY SCRAPE THE WHOLE 2-300 ACRES
SO THAT THERE'S NOTHING IN THE WAY OF PUTTING IN THE INFRASTRUCTURE--
THE ROADS, THE SEWERS, EVERYTHING ELSE.
HERE AT I'ON ONE OF THE THINGS THAT I'VE BEEN ADMIRING
IS THE FACT THAT THEY'VE LEFT EVERYTHING IN PLACE.
YOU BUY THE LOT, YOU DO SELECTIVE CLEARING.
YOU GET RID OF THE SCRUB THAT MIGHT BE IN THE WAY
OF WHERE YOU WANT TO PLACE YOUR HOUSE.
BUT IF YOU'RE LUCKY ENOUGH TO HAVE A TREE LIKE THAT ONE
OR LIKE THIS ONE OVER HERE
IN SIGHTS EITHER ON YOUR LAND OR CLOSE TO IT,
IT'S VERY IMPORTANT TO TRY TO PRESERVE IT.
YOU CAN SEE HOW THESE TREES
REALLY GIVE THE NEIGHBORHOOD A SENSE OF HISTORY
OF HAVING BEEN HERE FOR A WHILE.
BUT LET'S GO FIND KEVIN KALMAN, OUR GC.
KEVIN'S A TRANSPLANTED NEW ENGLANDER
WHO BUILT HOUSES ON NANTUCKET FOR MANY YEARS.
HEY, THIS IS COMING ALONG BEAUTIFULLY, KEVIN.
GOOD TO SEE YOU AGAIN, BOB.
YEAH, LIKEWISE. NOW WE WERE JUST LOOKING
AT THE BEGINNING OF THE SHEATHING
ON THIS PART OF THE FRAME LAST WEEK.
AND AT THIS POINT, WE'VE GOT A HOUSE IN PLACE.
IT'S STARTING TO LOOK LIKE SOMETHING. WE'RE GOING VERTICAL.
YEAH, SO THE ORIENTED STRAND BOARD
IS BEING USED BOTH FOR THE EXTERIOR SHEATHING
OF THE ENTIRE HOUSE AND ALSO FOR THE ROOF SHEATHING.
THE ROOF SHEATHING IS PLYWOOD, IT'S TECHSHIELD.
IT IS THE TECHSHIELD, THAT'S RIGHT.
WE WERE TALKING ABOUT THAT EARLIER.
AND THAT'S WHAT WE'VE GOT OVER HERE, RIGHT?
THAT'S CORRECT. IT'S GOT A FOIL APPLIED TO ONE SIDE
WITH A BUNCH OF MICRO-PROCESSED HOLES
ALL APPLIED IN THERE.
RIGHT. WELL, WE'RE GONNA LEARN ALL ABOUT IT
A LITTLE BIT LATER IN THE SHOW.
RIGHT NOW, LET'S TAKE A CLOSER LOOK AT THE LAY-OUT OF THE HOUSE.
YOU'VE GOT A LOT OF PROGRESS HERE.
I MEAN, THIS IS ALL PARGED.
LAST WEEK, WE WERE JUST LOOKING AT THE CONCRETE BLOCKS HERE
AND ALONG THE FOOTING OF THE HOUSE.
THIS IS THE FIRST COAT OF A 3-COAT STUCCO SYSTEM.
THIS IS OUR SCRATCH COAT,
SO IT'S BEEN APPLIED AND THEY'LL COME ALONG
AND PUT A FINISH COAT AND THEN A COLOR COAT ON IT.
IT'S CALLED A SCRATCH COAT BECAUSE AFTER YOU TROWEL IT ON,
THEN AS IT'S SETTING UP, YOU COME BY AND YOU SCRATCH IT,
AND THAT'S WHAT'S GOING TO PROVIDE THE BITE FOR THE FINAL COLOR.
THAT'S THE ADHESION.
THAT'S THE IDEA AT LEAST.
WELL, LET'S CLIMB UP HERE ON THE PORCH.
NOW LOOKING UP THERE,
IT SEEMS LIKE ALL THE ROOF SYSTEMS HERE ARE STICK BUILT.
OH, THEY ARE.
WHEN IT COMES TO THESE PORCHES, BOB,
WE LIKE TO CUT 'EM BY HAND,
WITH ALL THIS BEAM STRUCTURE.
THIS IS GOING TO BE A VAULTED ROOF.
WE REALLY WANT IT TO BE HAND DONE.
YEAH, SO YOU ARE GOING TO SEE SOME OF THIS?
IT'LL ALL BE VAULTED.
WE'LL END UP WITH ALL THAT VOLUME SPACE.
WE THINK THAT'S IMPORTANT.
YEAH. NO, IN THIS PARTICULAR PLAN,
I THINK IT WORKS BETTER THAN HAVING A FLAT CEILING.
NOW THE PROPORTIONS OF THE PORCH ARE ENORMOUS.
ABOUT 9 FEET IN DEPTH, 48 FEET IN LENGTH,
AND WE GO BACK 16 FEET ON THE TWO WINGS.
THAT'S SO NICE, SO WE GOT ENTRANCES INTO THE HOUSE
ON THIS SIDE AND ON THE OTHER SIDE?
THIS IS THE ENTRANCE TO THE KERNEL.
THIS IS THE MAIN ENTRANCE TO THE HOUSE.
OK, AND THESE 3 THEN ARE JUST SETS OF FRENCH DOORS
THAT LEAD INTO THE LIVING ROOM.
CORRECT. 4 FOOT BY 8 FOOT FRENCH DOORS.
NOW, OSB IS NOT SOMETHING THAT YOU'RE REALLY GOING TO USE
AS DECKING ON A PORCH LIKE THIS, RIGHT?
WE PUT THESE DOWN TO WORK OFF OF--
TO DO THE ROOF SYSTEM, WE'LL PULL THIS ALL UP
AND USE IT ON THE GARAGE WALLS.
THEN THESE POSTS HERE REPRESENT WHERE THE ACTUAL COLUMNS WILL BE PLACED?
CORRECT. ALL OF THE COLUMNS WILL BE BASICALLY IN THE SAME LOCATION
AS THE SUPPORTS THAT YOU SEE NOW.
MM-HMM.
AND THEY ARE NOT REALLY THE KEY
TO TYING THE STRUCTURE TOGETHER-- THE DECK AND THE ROOF,
THERE'S A METAL STRAP THAT GOES INSIDE THE COLUMN, RIGHT?
YES. WE USE A STRAP THAT GOES FROM THE--
TIES TOGETHER FROM THE HEADER DOWN BELOW
UP TO THE HEADER UP ABOVE
AND THAT--THAT IS TAUT AND IT KEEPS THE UPLIFT FROM HAPPENING
AND THE COLUMN ITSELF IS THE LOAD-BEARING ITEM.
WELL, LET'S TAKE A LOOK AROUND BACK.
AND THIS IS AN ADDITIONAL PORCH
ON THE BACK OF THE HOUSE, RIGHT?
THAT'S RIGHT. IT COMES OFF OF THE DINING ROOM HERE, BOB.
IS THIS THE LAST OF THE STRUCTURAL WORK TO BE DONE?
NEXT TO LAST.
WE'VE GOT THE ROOF FRAMING AND THE GARAGE.
OK.
GO TO...
FOR MORE INFORMATION ABOUT THE I'ON NEIGHBORHOOD
AND SIMILAR COMMUNITIES.
THAT IS A FINE GABLE ROOF THAT YOU'RE LOOKING AT UP THERE,
WHERE ALL THE RAFTERS ARE BASICALLY COMING TOGETHER AT THE RIDGEPOLE.
AND WHAT WE'RE DOING NOW IS CREATING
A SIMILAR ROOF ON A SMALLER SCALE.
[HAMMERING]
ALL OF THE RAFTERS HAVE TO OBVIOUSLY BE IDENTICAL,
AND SO THAT'S WHY THEY START OFF THE PROCESS WITH A PATTERN.
AND THE PATTERN HELPS YOU TO MAKE ALL OF THE CUTS
FOR WHAT'S KNOWN AS THE BIRD MOUTH,
WHICH IS THAT PART OF THE RAFTER THAT SITS ON THE OUTSIDE WALL
ON THE ACTUAL TOP PLATE OF THE OUTSIDE WALL.
AND THEN THE ANGLED CUT...
THAT DETERMINES THE PITCH OF THE ROOF.
AND THESE ROOFS ARE RUNNING 4 AND 12. IS THAT RIGHT, KEVIN?
THAT'S CORRECT.
WHICH MEANS FOR EVERY 12 FEET
THAT IT RUNS HORIZONTALLY,
IT GOES UP 4 FEET.
AND MANY TIMES IN MODERN CONSTRUCTION,
ALL YOU HAVE ARE TRUSS SYSTEMS,
WHICH ARE TERRIFIC AND THEY'RE COST EFFICIENT.
ARE WE OUT OF WHACK A LITTLE BIT?
IT DON'T MATTER.
AND SO THAT'S JUST TACKED IN PLACE,
AND NOW WE'LL BE READY TO TAKE THIS RIDGEPOLE
AND PUT IT UP THERE.
GO AHEAD.
NOW THE RIDGE SUPPORTS THE UPPER END OF THE RAFTERS
AND THE RIDGE THAT WE'RE USING HERE
IS MADE OF LAMINATED VENEER LUMBER OR LVL.
WOOD VENEER IS LAYERED
IN A MANNER SIMILAR TO PLYWOOD TO MAKE THIS BEAM.
THE ORIENTATION OF THOSE LAYERS MAKES THIS LVL
A LOT STRONGER THAN DIMENSIONAL LUMBER.
AND, RUSSELL, ISN'T IT NICE WHEN IT FITS RIGHT THE FIRST TIME?
SURE IS, BOB.
MAKES THINGS A LOT EASIER.
NOW AT THE OTHER END...
WE HAD A DEADMAN IN PLACE,
A SHORT PIECE OF 2x4,
SO THAT ALTHOUGH WE SEEM TO HAVE JUST ONE CARPENTER DOWN AT THAT END,
IN FACT THE RIDGEPOLE IS BEING HELD UP BY A 2x4.
ALL A MATTER OF PLANNING.
OK, NOW, KEVIN, DOES IT MATTER
WHETHER YOU STAGGER THEM
OR PUT THEM ALL ON ONE SIDE AT ONCE OR...
YOU CAN START TO PUT THEM ALL ON ONE SIDE
AS LONG AS YOU HAVE SOME BRACING ON THE OTHER SIDE, BOB--
JUST TO STIFFEN THEM.
JUST TO STIFFEN THEM,
AND WE'VE GOT ONE ON THIS SIDE, WHICH IS RIGHT HERE,
AND IT'S STIFFENING THE RIDGEPOLE,
SO WE'RE GOING TO PRESENT ALL OF THESE INTO PLACE ONE BY ONE.
WE'RE USING 2x10 DIMENSIONAL LUMBER FOR THE RAFTERS.
YOU CAN SEE HOW THE BIRD MOUTH CUT
FITS ON THE TOP PLATE OF THE OUTSIDE WALL
AND THE ANGLED CUT FITS AGAINST THE RIDGE.
THE PATTERN THAT WE USED ENSURES THAT ALL OF THE CUTS ARE CONSISTENT.
SINCE WE PRE-CUT ALL OF THESE RAFTERS THEY GO PRETTY FAST.
THEY'RE JUST TOENAILED USING 16 PENNY COMMON NAILS.
KEVIN, IS THERE A REASON THAT WE DIDN'T USE
PREFABRICATED ROOF TRUSSES FOR THESE ROOF SYSTEMS?
THIS SECTION THAT WE'RE FRAMING RIGHT NOW, BOB,
IS A CATHEDRAL OF ALL THE SECTIONS.
AND WE WANT TO GET THAT 10 INCHES OF INSULATION RIGHT IN HERE,
SO THAT'S ONE OF THE REASONS,
THE OTHER IS TIME.
THIS HAS BEEN KIND OF A FAST-TRACK JOB.
WE JUST DIDN'T HAVE TIME TO ORDER THEM,
SO WE'RE GOING WITH STANDARD STICK CUT ROOF,
AND WE'LL HAVE OUR INSULATION AND AIR SPACE
ALL IN THIS 2x10 SECTION.
OK. WELL, LET'S LET THESE GUYS FLY
WITH THE REST OF THE RAFTERS.
YEAH, YOU GOT IT.
ALL RIGHT, THAT'S THE LAST ONE ON THIS END.
NOW, KEVIN, DO WE PUT THE HURRICANE CLIPS ON NEXT?
WE HOLD ON THE HURRICANE CLIPS, BOB,
UNTIL WE GET THE PLYWOOD ON THE EXTERIOR.
AND THE HURRICANE CLIP GETS ATTACHED THROUGH THE PLYWOOD
TO THE TOP PLATES INTO THE RAFTER.
OK AND THAT'S PART OF THE STRENGTH OF THE SYSTEM, RIGHT?
YES, IT IS.
OK.
THAT WAS EASY ENOUGH.
NOW LET'S JUST DO THE WHOLE THING OVER ON THE OTHER SIDE.
ONCE ALL OF THE RAFTERS ARE IN PLACE ON THIS SIDE OF THE ROOF,
THE ROOF AND THE OUTSIDE WALLS WILL BE READY FOR SHEATHING.
WE'LL BE USING SOME NEW ROOFING TECHNIQUES
THAT WILL STRENGTHEN THIS ROOF AGAINST HIGH WINDS.
NEXT, WE'LL SEE SPECIAL TECHNIQUES
FOR ATTACHING THE ROOF COMPONENTS
TO WITHSTAND HURRICANE WINDS.
NEXT TIME ON...
WE FINISH UP THE FRAMING
ON OUR SOUTH CAROLINA LOW-COUNTRY HOUSE.
WE'LL BE RAISING THE RIDGE AND THE RAFTERS FOR THE ROOF.
AND WE'LL BE USING SPECIAL HARDWARE AND NAILING TECHNIQUES
TO STRENGTHEN THE ROOF IN HIGH WINDS AND HURRICANES.
THEN WE'LL BE COVERING THE WALLS WITH HOUSE WRAP.
WE'LL ALSO TAKE A LOOK
AT SOME OF THE OTHER HOUSES IN THE NEIGHBORHOOD.
MOST ARE BEING BUILT IN THE TRADITIONAL
CHARLESTON ARCHITECTURAL STYLE
WITH DOUBLE-STORIED PORCHES AND CEILING FANS.
THAT'S NEXT TIME ON HOME AGAIN.
DON'T MISS IT.
NEXT TIME ON...
WE RAISE THE ROOF RAFTERS,
STRENGTHEN THE ROOF FOR HURRICANES,
AND TACK ON THE HOUSE WRAP. DON'T MISS IT.
OK, SO WE'RE NOW SHEATHING THE BACK PORTION OF THIS ROOF.
AND JOINING ME IS BRIAN READLING
FROM THE APA--ENGINEERED WOOD ASSOCIATION,
WHO'S GOING TO HELP US UNDERSTAND
A LITTLE BIT ABOUT THE NEW TECHNOLOGIES OF SOME OF THESE MATERIALS.
WE JUST WERE LOOKING AT THE CLIPS, BRIAN,
THAT ARE ON THE RAFTERS
AS THEY JOIN THE TOP PLATE OF THE WALL,
AND THAT'S THESE LITTLE THINGS HERE.
WHAT'S THE PURPOSE OF THESE?
BASICALLY, THAT ENABLES US TO LOAD THE NAIL.
INSTEAD OF PULLING THE NAIL OUT
LIKE A TRADITIONAL TOENAIL,
THESE CLIPS ACT TO SHEAR THE NAIL OFF
OR SHEAR THE HEAD OF THE NAIL OFF,
WHICH OFFERS A LOT MORE STRENGTH
THAN JUST SIMPLY PULLING THE NAIL OUT.
EXACTLY. THE NAIL IS DRIVEN HORIZONTALLY
INTO THE TWO WOODEN MEMBERS,
EITHER DOWN AT THE PLATE
OR DOWN INTO THE RAFTERS.
AND THAT GIVES IT MORE STRENGTH,
AND WHEN THERE IS A HURRICANE SITUATION
AND THAT LIFT IS TRYING TO BRING THE ROOF OFF OF THE HOUSE,
THIS WILL PREVENT--
RIGHT.
IT WILL HELP TO PREVENT IT.
IT'S ALL PART OF OUR CONTINUOUS LOAD PATH
THAT WE NEED ALL THE WAY FROM THE TOP OF OUR ROOF
ALL THE WAY DOWN TO THE FOUNDATION.
RIGHT. WE'VE LOOKED AT OTHER ASPECTS OF IT ALONG THE WAY.
NOW THE TECHSHIELD IS A PRODUCT
THAT WE'RE USING TO SHEATH THE ROOF.
AND IT'S ESSENTIALLY A PLYWOOD
WITH A REFLECTIVE SURFACE.
AND I'VE GOT IT UPSIDE DOWN HERE
SO THAT WE CAN LOOK AT IT,
BUT THIS WILL BE FLIPPED OUT,
AND THE REFLECTIVE SURFACE FACES THE ATTIC SPACE.
NOW THIS IS A HOT WEATHER PRODUCT.
THIS IS NOT SOMETHING THAT'S DESIGNED FOR COLDER CLIMATES,
BUT RATHER FOR AREAS WHERE YOU CAN REDUCE
THE AMOUNT OF HEAT GAINED
INTO THE ATTIC SPACE BY UP TO 30 DEGREES
BECAUSE THIS WILL ACTUALLY ACT AS A MIRROR.
IT WILL RADIATE THE HEAT RIGHT BACK
THROUGH THE PLYWOOD AND THE SHINGLE
AND WON'T LET IT GET INTO THE ATTIC SPACE,
SO IT'S A REAL ENERGY SAVER.
WHAT ABOUT HOW IT SHOULD BE ATTACHED, BRIAN?
WELL, ATTACHMENT OF ROOF SHEATHING IN A HIGH WIND AREA
LIKE WE HAVE HERE IS CRITICAL.
A LOW-SLOPE ROOF-- THE LOWER THE SLOPE,
THE MORE UPLIFT YOU HAVE. AND IN THIS CASE,
WE WOULD RECOMMEND A RING-SHANK NAIL BE USED,
BECAUSE OF THE ADDITIONAL WITHDRAWAL CAPACITY.
RIGHT.
AND THAT WOULD BE LOCATED AT 4 INCHES
ON THE CENTER ALONG THE END OF THE PANELING,
6 INCHES ON THE CENTER ALONG THE INTERMEDIATE FRAMING MEMBERS.
AND THE POINT OF THE RING-SHANK
IS A LITTLE BIT LIKE A SCREW.
IT'S NOT QUITE A SCREW,
BUT IT DOES GRIP AND IT WON'T SLIP BACK OUT OF THE WOOD.
IT HAS A LOT MORE WITHDRAWAL VALUE THAN A SCREW.
RIGHT. AND WHAT ABOUT ADHESIVES?
DO YOU RECOMMEND THE USE OF ANY KIND OF PANEL ADHESIVES ON THE SHEATHING?
WE DON'T REALLY RECOMMEND THE USE OF AN ADHESIVE
BECAUSE THAT TENDS TO SQUEEZE OUT IN THE PANEL JOINTS.
AND WE LIKE THOSE JOINTS TO MAINTAIN A 1/8th OF AN INCH SPACE,
SO THAT THE PANELS CAN EXPAND, MORE OR LESS AN EXPANSION JOINT.
AND WITH THE ADHESIVE IN THAT JOINT,
IT KIND OF RESTRAINS THE PANEL FROM EXPANSION.
HOWEVER, AS I UNDERSTAND IT,
THE SHEATHING SYSTEM OF A ROOF AND A HURRICANE
CAN STILL KEEP A LOT OF WATER OUT,
AND MOST OF THE DAMAGE IN A HURRICANE IS FROM WATER, RIGHT?
RIGHT. INSURANCE INDUSTRY STUDIES HAVE SHOWN
THAT ONCE THE ROOF COVERINGS OR THE ROOF SHEATHING IS LOST
AND WATER COMES INTO THE BUILDING,
WE'VE LOST ABOUT 80% OF THE TOTAL VALUE
OF OUR STRUCTURE AND ITS CONTENTS.
ONE OF THE PRODUCTS THAT'S KIND OF BEING SEEN MORE AND MORE
IS THIS PEEL AND SEAL BITUMINOUS MEMBRANE.
IT'S STUCK ACROSS THE PANEL JOINTS
TO KEEP THE RAIN OUT IF THE ROOF COVERING IS LOST.
THIS SEALS THE JOINTS OF THE PLYWOOD OR THE OSB
SO WATER DOESN'T RUN BETWEEN THE JOINTS AND INTO YOUR HOUSE.
NOW THE FACT THAT THEY HAVE A SHINY SIDE IS TOTALLY COICIDENT.
IT HAS NOTHING TO DO WITH THE SHINY SIDE ON THE TECHSHIELD.
NO.
WELL, BRIAN, THANKS FOR COMING OUT.
OK!
WHEN WE COME BACK, WE'RE READY FOR HOUSE WRAP.
DON'T GO AWAY.
KEVIN AND I ARE BEING JOINED BY STEVE EASLEY
WHO IS CONSTRUCTION CONSULTANT AND, UH...
WE'RE GOING TO TALK ABOUT THE REASON
WHY IT MAKES A LOT OF SENSE
TO WRAP UP A HOUSE WITH HOUSE WRAP.
STEVE, WHAT IS THIS STUFF?
WELL, IT MAY LOOK LIKE JUST AN ORDINARY SHEET OF PLASTIC,
BUT IT'S ACTUALLY VERY FINE POLYETHYLENE FIBERS
THAT ARE BONDED UNDER HEAT AND PRESSURE
TO MAKE A WEATHER-RESISTANT BARRIER FOR YOUR HOUSE.
OK. I'VE ALWAYS CALLED IT OLEFIN.
IT'S VERY IMPORTANT TO KEEP IT PLUMB. THERE YOU GO.
ABSOLUTELY.
AND, UM...
THE TERM OLEFIN BASICALLY MEANS THAT--
A SPUN POLYESTER?
IT'S A POLYETHYLENE FIBER, ACTUALLY.
IT'S ACTUALLY SMALLER THAN A HUMAN HAIR.
AND THE WAY IT WORKS--
WELL, TELL ME HOW IT WORKS.
WELL, THE CONCEPT IS THAT, YOU KNOW, A LOT OF BUILDERS
WILL BUILD HOMES AND NOT PUT ANY TYPE
OF WEATHER-RESISTANT BARRIER UNDERNEATH THE CLADDING.
AND ALL CLADDING SYSTEMS LEAK, OF COURSE.
WHETHER IT'S A CEDAR CLAPBOARD LIKE WE'LL HAVE HERE
OR VINYL SIDING OR STUCCO--ANY KIND OF CLADDING SYSTEM OR SKIN
IS GOING TO ALLOW A CERTAIN AMOUNT OF WEATHER TO GET IN.
ABSOLUTELY. AND WHAT THIS DOES,
IF WATER DOES GET BEHIND, AND IT ALWAYS DOES,
BEHIND THE CLADDING IT DRAINS OFF
WITHOUT BEING SUCKED INTO THE SHEATHING,
WHERE IT CAN CAUSE WOOD TO ROT OR MOLD OR MILDEW
AND CAUSE LOTS OF PROBLEMS.
AND, OF COURSE, ANOTHER GREAT FEATURE
IS THAT IT'S A GREAT AIR FILTRATION BARRIER.
EACH HOME HAS ABOUT, YOU KNOW, OVER 2,000 FEET
OF CRACKS AND GAPS.
IS THAT RIGHT?
THAT'S RIGHT.
2,000 LINEAR FEET OF CRACKS AND GAPS
IN THE AVERAGE HOME,
SO THAT WHEN YOU PUT THE HOUSE WRAP ON IT,
YOU'RE PREVENTING THAT MUCH AIR INFILTRATION, RIGHT?
THAT'S RIGHT.
WELL, WHAT ABOUT TRAPPING THE MOISTURE IN THE HOUSE?
DON'T YOU HAVE TO WORRY ABOUT THAT?
WELL, THAT'S REALLY THE NEAT THING ABOUT THIS PRODUCT.
IT'S REALLY AN ENGINEERED PRODUCT
THAT ALLOWS YOU TO HAVE THESE LAYERS OF FIBERS
THAT ARE MADE IN SUCH A MANNER
THAT MOISTURE VAPOR DROPLETS CAN GET OUT
BUT WATER CAN'T GET IN.
OK.
SO IT'S KIND OF LIKE A GORETEX.
SO IF YOU HAVE TOO MUCH HUMIDITY IN THE HOUSE,
IT CAN WORK ITS WAY OUT,
BUT IF YOU GET A BIG BLOW ON THE OUTSIDE,
IT WON'T WORK ITS WAY IN.
WELL, THE AVERAGE FAMILY PUTS OUT ABOUT 70 PINTS OF MOISTURE A DAY,
SO THAT MOISTURE BUILDS UP INSIDE THE HOME,
BUT IF IT GETS INSIDE YOUR WALL SYSTEM,
IT CAN CAUSE LOTS OF PROBLEMS.
OK. NOW WE GOT TO PUT ANOTHER LAYER UP AT THE TOP.
OK, IT'S GOOD AND TIGHT, STEVE.
NOW CUTTING THE OPENING IN THE WINDOW--
WE USED TO JUST MAKE THAT AN "X" AND PULL IT BACK,
BUT YOU'RE MAKING A DIFFERENT KIND OF A SHAPE THERE, AREN'T YOU?
THAT'S RIGHT. THIS HERE IS A MUCH MORE EFFICIENT WAY
TO REALLY INSTALL THE PRODUCT,
BECAUSE IT ALLOWS YOU TO--
IF YOU'LL LET ME HAVE YOUR STAPLER THERE--
GIVE ME THE KNIFE BACK.
WE'RE SHORT ON TOOLS HERE TODAY.
IT ALLOWS YOU TO TAKE THIS IN AND REALLY...
PULL THIS IN AND THAT WAY YOU NEVER TRAP WATER AT THE HEAD.
IT'S A LITTLE BIT LIKE GIFT WRAPPING,
WHICH IS NOT ONE OF MY FORTES, BUT--
IT IS.
WHAT DO YOU DO UP HERE?
JUST SLASH THAT AT THE TOP?
WELL, I'M ACTUALLY GOING TO CUT THAT AGAIN.
OK, BUT TELL ME ONE LAST THING,
WHAT ABOUT TAPE? DON'T YOU HAVE TO USE TAPE WITH ALL OF THIS?
THAT'S RIGHT. ACTUALLY, THERE'S A SPECIAL TYVEK TAPE.
AND IT'S IMPORTANT THAT, OF COURSE,
YOU ALWAYS PUT THE TYVEK ON SO THAT THE TOP LAYER
ALWAYS SHINGLES OVER THE FIRST AND THEN WRAP THIS
WITH THE TYVEK TAPE.
ALL RIGHT, SO THAT'S THE PLACE WHERE THE TAPE GOES.
OK, WELL, THANKS A LOT.
WE'RE RUNNING SHORT ON TIME,
BUT COME HOME AGAIN NEXT WEEK.
WE'RE GOING TO BE PUTTING UP COLUMNS IN PLACE.
WE'LL BE BUILDING A RUMFORD FIREPLACE INSIDE THE HOUSE.
TILL THEN, I'M BOB VILA.
IT'S GOOD TO HAVE YOU HOME AGAIN.
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