Questions tagged [crawlspace]

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14
votes
1answer
6k views

What are the disadvantages of having electrical conduit penetrate my foundation below-grade?

I'm having an electrician wire a lamppost in the backyard. His initial proposal was to do something like this picture shows: (The diagram is from this article.) The conduit's rise from the ground and ...
12
votes
6answers
3k views

Wiring a reliable temperature switched outlet

I have an electrical wiring question. Background: I'm building my house by contracting out the daunting parts. Through a lack of good communication with the plumber, my plumber ran most of my PEX ...
10
votes
2answers
6k views

Mold remediation in crawlspace

Just bought a 25 year old home that has improperly installed insulation in the crawlspace. The insulation is fiberglass rolls with a paper backing, and is installed with the paper facing down, toward ...
9
votes
11answers
25k views

How can I remove mice from my house?

I live in a townhome which is a 2nd and 3rd floor unit. On the 3rd floor is a closet with a crawlspace entrance which is the attic. There are definitely mice running around in there. I tried to ...
9
votes
6answers
20k views

What protection is needed to access the crawlspace under the house?

We have a crawlspace about 2 feet tall under the house. (Scary!) Looks like it has a black plastic barrier on the ground (which I believe is just dirt). How should one dress to crawl under there, and ...
8
votes
2answers
3k views

GFCI tripping on overload?

We called out the contractor who did our crawlspace encapsulation because the GFCI receptacle that serves the crawlspace loads (dehumidifier, sump pump, and two humidistat controlled fans) trips ...
8
votes
3answers
10k views

What are the pros and cons of a vented vs unvented crawl space?

I find it very confusing to read and hear conflicting advice on crawl space: vent vs air seal, different ways to do insulation, vapor barriers vs not, etc. Mine currently has some moisture and has ...
7
votes
4answers
2k views

Is moisture a concern with solid hardwood flooring over a crawl space?

I recently purchased around 600 sq feet of 3 1/4 inch solid hickory from Bruce, which I'm installing over a crawl space. I put down a 6 mil vapor barrier in the crawl space. I'm measuring the ...
7
votes
1answer
748 views

Tree stump in crawlspace surrounded by boards and covered in concrete?

I had a home inspection done today and the inspector told me this was a first: In the crawlspace there was a large box filled with concrete. It looks like this: Image source The builder was there ...
6
votes
3answers
4k views

What is the minimum height to a crawl space, and where did you get that information?

I am working with a customer and it was a great question. I was trying to find the exact answer.
6
votes
3answers
14k views

How can I get rid of fleas in my crawlspace forever?

I have lived in my house since 2007. I have a large crawlspace (dirt floor, ranging in height) where I have a nice woodworking shop. In 2011 the shop became infested with fleas, but not the ...
6
votes
1answer
3k views

Insulating ducts in a crawlspace

Consider a source duct from the furnace/AC. The ducts run in a vented crawlspace. The floors atop the crawlspace are a mix of hardwood and kitchen vinyl. The symptoms are: the longer run vents aren'...
6
votes
4answers
9k views

How do I insulate the ceiling in my crawlspace?

I'm desperately looking for some advice on how to properly insulate the crawl space. I live in eastern Massachusetts where it has recently been in the teens and 20s for low temps in winter. I have a ...
5
votes
2answers
387 views

Curtain drain in the crawl space - Part 3

I've dug out a trench around the perimeter of my crawl space. Then I planned the next steps. I took a week off but I'd like to finish this project next weekend. I'm going to put a 4" perforated pipe. ...
5
votes
1answer
1k views

Sump with no pump!

A rainy month and water in the crawlspace: It's was an unusually wet April where I live. I went into my crawlspace last week to change the filter on the A/C and found water. The crawlspace is ...
5
votes
2answers
5k views

What can I do in this vented crawlspace to keep the room above warmer?

I've recently moved to a new home. This home had an addition that was built on top of a Crawlspace that is vented to the outside. Needless to say, the morning after the first cold night made me ...
5
votes
1answer
337 views

Was coal ever used as an insulator?

In pulling off some broken mortar on the dirt foundation (where the actual brick footers rest) of a 1920's house crawl space, I discovered a layer of black coal just under the mortar. There are ...
5
votes
6answers
42k views

Should I encapsulate my crawl space?

Our home was built with a dirt crawl space that is about 2' from ground to bottom of floor joist. The floors are insulated with fiberglass held up (where it hasn't fallen down) with wire rods. The AC/...
5
votes
1answer
3k views

How do I cut a new crawlspace access in a brick foundation?

When my house was built, the crawlspace access was put on the high side of the property, which I'm sure gave the subcontractors the easiest access for HVAC, wiring, etc. But there is very little ...
5
votes
1answer
5k views

How should I install a curtain drain in my crawl space?

Since I have wet areas in the crawl space, I have decided to dig a trench at the perimeter of my crawl space to take care of the water. This would also allow me to install rigid foam insulation on ...
5
votes
1answer
5k views

How far from the foundation and how deep should a French drain be?

My wife and I bought a house recently but sadley the rainy season has come and I noticed a bad smell coming from the crawlspace I went under neath and found standing water about a inch deep running ...
4
votes
2answers
327 views

Should I periodically air out the vapor barrier in my crawlspace?

I have a vapor barrier in my crawlspace which is made of multiple sheets of 6-mil plastic. One contractor suggested that in the dry months I should pull back the sheets of plastic and allow the dirt ...
4
votes
3answers
6k views

Should I use foam spray insulation in my crawl space?

My crawl space has no insulation. The dirt is wet near one of the walls. There have been termites in the past. I'm thinking of insulating the ceiling (between the joists) and the walls with foam ...
4
votes
2answers
424 views

Things to look for while entering the crawlspace of a house I'm considering buying?

I'm going to examine the crawlspace under a house I'm considering buying. What type of things should I look for? Here's my list so far: Water, moisture, and dampness -- finding it's source. ...
4
votes
1answer
288 views

Curtain drain in the crawl space - Part 2

Part 1 is done. We've dug a trench at the interior perimeter of the crawl space. It took 8 hours 3-4 people (I was working myself but not all the time) and one dump truck. Total budget was around $...
4
votes
2answers
9k views

Does wire run in conduit in a crawl space need to be rated for moisture?

Quick question for all the electricians out there. I'm in the states and looking to make a couple new electrical runs for the outside of my house. The runs will be done inside my crawl space inside ...
4
votes
3answers
298 views

Is it a problem that my laundry drain protrudes above ground level?

My plumber just moved the laundry's washer drain location and this is the picture from the outside: It was re-connect to the old drain pipe and go into crawl space. My question is: Does it look ...
4
votes
2answers
5k views

Is it okay to put a heat pump water heater in a crawl space?

I have a pretty large crawl space. It is 80 inches wide and around 7 feet high. I am looking to replace the 50 gallon electric water heater with the new Geo Spring Water heater by GE This unit is wide ...
3
votes
2answers
194 views

Is there a reason to replace 50 year old metal ducting in the crawlspace with modern insulated flexible ducting?

My concern is heat loss in the chilly crawlspace. No AC here, only forced air gas furnace. The existing metal ducting in the crawl space is over 50 years but is intact. There is a very thin layer of ...
3
votes
2answers
138 views

Is this open supply duct in my vented crawl space necessary?

New (first-time) home owner here (4 months in). I recently discovered what at first seemed like an un/disconnected supply-side duct in our vented (open) crawl space. Photo attached. After several ...
3
votes
3answers
3k views

Crawlspace Drainage

I am beginning the installation of a Crawlspace Perimeter drain. I discovered that the concrete footing extends about 12" into the crawlspace. As I was going to place the NDS EZ drain pipe ...
3
votes
3answers
8k views

Renovating Crawlspace with Poured Concrete Floor

My newly-purchased 1950s home has a below-grade crawlspace with a poorly-poured concrete floor. Specifically, it is very coarse and looks like it was poured and spread with a garden rake. In some ...
3
votes
1answer
317 views

What is this rocky area in my crawl space wall?

We see a water line coming down from a strange, rocky section in our crawl space wall. I will dig down to the foundation outside the house and repair/fill any cracks externally, but am wondering: why ...
3
votes
4answers
3k views

What could be the source of dirt in attic

I've had occasion to get up in the attic of my (new, to me) house recently. There is what appears to be dirt all over everything up there, with actual accumulation in places. This is a 2-story ...
3
votes
1answer
162 views

Why can't an encapsulated and dehumidified crawl space have vents sealed off?

I found SECTION R408.3 of the International Residential Code which says that unvented crawl spaces are only allowed if one of the following is true: There is exhaust ventilation fan running ...
3
votes
1answer
110 views

Exceptions for support when fishing crawlspace wiring

After having cut a hole in the wall to peek into the crawlspace, it seem rather feasible to relocate our 3-prong dryer receptacle to a new location by running new 4-wire cable all the way back to the ...
3
votes
3answers
3k views

Properly Attach Cabling To Joists

I am running cabling through my crawlspace roughly 40 feet. I have the holes drilled, and am leaving about 25 feet extra looped off for contingency. I am planning to attach the cabling to the joists ...
3
votes
1answer
2k views

Vacuum Excavator for crawl space

What do people think of this method for excavating a crawl space: http://www.mvtimes.com/news/2007/11/21/vacuum-excavator.php
3
votes
1answer
605 views

Remove Foundation Concrete Block

We are having HVAC ductwork installed in our crawlspace and one of the companies mentioned they do not remove foundation concrete blocks due to liability. Unfortunately, for us to have registers in ...
3
votes
1answer
830 views

How to eliminate odor from crawl space

I'm trying to eliminate damp odor originating from a crawl space. Here's the situation: Half of the house has a basement. The other half is a crawl space accessible from the basement through an ...
3
votes
3answers
2k views

How to choose floor insulation?

My question is about insulating the ground floor. I have a crawlspace under the floor which is vented and therefore quite cold (average temp in the winter is 4 °C and in the summer 13 °C plus ...
3
votes
0answers
91 views

Drilling holes in crawl space block foundation

I did a crawl space encapsulation myself. I used foundation pins to secure the vapor barrier to the walls every 16". Unfortunately, my walls were so wet I couldn't use a butyl tape like the ...
3
votes
1answer
398 views

Widening the stone entrance into a crawlspace

I've got a 200 year old house with a crawl space under one corner of the house. The entrance to that crawl space is very tight (pictured below), and I am a large man. I want to expand the entrance to ...
3
votes
2answers
498 views

Stackable washer/dryer covering crawlspace access point

Background 1940s home has a stackable washer/dryer combo unit installed over the crawl space access door. I want to replace the unit with a new combo such that: The crawl space door is readily ...
3
votes
4answers
5k views

Found hole with water under house

Today, while in the crawl space under the house, I found a large hole that has water in it. Now I'm trying to figure out what to do about it. I had noticed a depressed area under the house in the ...
2
votes
3answers
241 views

What is the difference between mold in air duct and mold that grows in crawl space?

Specifically, are they both dangerous to human health?
2
votes
1answer
567 views

Can I have two storeys in a 16 foot space?

I'm in the process of closing on a house that has an unusually large crawlspace underneath the structure. The house is built on a relatively steep hillside and the frame of the house extends to the ...
2
votes
1answer
131 views

What's this wire coming out of my crawl space?

I have an unknown wire coming from the interior of my crawlspace to outside, and I'm trying to figure out what it is. I'd like to remove it possible so that the crawlspace door will shut nicely. I ...
2
votes
2answers
3k views

Can porcelain tile planks be installed in a crawl space house?

My home is a single story, about 1200 square feet, and is built on a crawl space foundation with a plywood sub-floor. The people we bought the house from had flipped the home after a foreclosure, and ...
2
votes
2answers
4k views

Is Flex Duct Safe To Use In A Crawl Space?

The home I purchased has a crawlspace below an addition that was put on to the original structure. The HVAC contractor that did the work ran 2 long runs of flex-duct to the 2 registers in the room of ...

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