Syntax Assistance Please

I'm doing something screwy.  This script runs thru a bunch of folders and checks the size, and it works (sort of) but I'm setting up the hash wrong.  It seems to reset for each folder it goes thru.  So the final output only shows space hogs in folderpathfour.

Yes, I am program develeopment challenged.  Is there a knowledge level before "Beginner?"

Eventually I want to put a little bit in here also to check the drive size of a specific drive on a file server.  five drives configured but I only want to check the space available on F drive.

This is my snipette for checking drive sizes (not the complete script).

$DCservers = @("serverone", "servertwo", "serverthree")
$body = @()
$recent = get-date
foreach ($server in $DCservers) {
$header = "----" + $server.ToUpper() + "----"
$driveinfo = Get-WmiObject -ComputerName $server win32_logicaldisk -filter DriveType=3 | format-table @{Label="Drive";Expression={$_.DeviceID}}, VolumeName, @{ Label = "Total Space"; Expression = {"{0,7:n2} GB" -f ($_.Size/1GB)}}, @{ Label = "Free Space"; Expression = {"{0,7:n2} GB" -f ($_.FreeSpace/1GB)}}, @{Label="Status";Expression={if($_.FreeSpace -lt ($_.Size*.3)) {"{0:n1}%  FREE" -f ((($_.freespace/1gb)/($_.size/1gb)*100))} else {"Acceptable"}}}
$Body += $header
$Body += $driveinfo
$Body += "`n"
}Start Free Trial

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[System.Net.Mail.MailMessage]$message = new-object System.Net.Mail.MailMessage
[System.Net.Mail.SmtpClient]$smtpClient = new-object System.Net.Mail.smtpclient("server.com")
$message.to.Add("emailaddressone")
$message.to.Add("emailaddresstwo")
$message.From = "emailaddressfrom"
$message.Subject = "User Home Drives over 5 GB"
$body =@()
$UserFolders = @(
	"\\server\folderpathone", `
	"\\server\folderpathtwo", `
	"\\server\folderpaththree", `
	"\\server\folderpathfour")
foreach ($startFolder in $UserFolders) {
  $SpaceHogs = New-Object System.Collections.HashTable
  $colItems = (Get-ChildItem $startFolder | Where-Object {$_.PSIsContainer -eq $True})
  foreach ($i in $colItems)
    {
        $subFolderItems = (Get-ChildItem $i.FullName -recurse | Measure-Object -property length -sum ) 
	If($subFolderItems.sum -gt 5GB)
	{
	$SpaceHogs[$i.name] = "{0:N2}" -f ($subFolderItems.sum / 1GB) + " GB"
	#$SpaceHogs = ($i.Name + " -- " + "{0:N2}" -f ($subFolderItems.sum / 1GB) + " GB")
	}
	else {}
    }
}
$message.body = $SpaceHogs.GetEnumerator() | Sort-Object value -Descending | Out-String
$smtpclient.send($message)